999927053795521 has 4 divisors (see below), whose sum is σ = 999927126822532. Its totient is φ = 999926980768512.

The previous prime is 999927053795491. The next prime is 999927053795543. The reversal of 999927053795521 is 125597350729999.

999927053795521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 823458120321600 + 176468933473921 = 28695960^2 + 13284161^2 .

It is a 3-Lehmer number, since φ(999927053795521) divides (999927053795521-1)³.

It is a cyclic number.

It is not a de Polignac number, because 999927053795521 - 2⁴⁹ = 436977100374209 is a prime.

It is a super-2 number, since 2×999927053795521² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999927053795321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9128376 + ... + 45641881.

It is an arithmetic number, because the mean of its divisors is an integer number (249981781705633).

It is a Poulet number, since it divides 2^{999927053795520}-1.

Almost surely, 2^{999927053795521} is an apocalyptic number.

999927053795521 is the 18256753-rd octagonal number.

It is an amenable number.

999927053795521 is a deficient number, since it is larger than the sum of its proper divisors (73027011).

999927053795521 is a wasteful number, since it uses less digits than its factorization.

999927053795521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73027010.

The product of its (nonzero) digits is 4340101500, while the sum is 82.

The spelling of 999927053795521 in words is "nine hundred ninety-nine trillion, nine hundred twenty-seven billion, fifty-three million, seven hundred ninety-five thousand, five hundred twenty-one".