505016716681 has 4 divisors (see below), whose sum is σ = 505018295572. Its totient is φ = 505015137792.

The previous prime is 505016716661. The next prime is 505016716727. The reversal of 505016716681 is 186617610505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 343982250000 + 161034466681 = 586500^2 + 401291^2 .

It is a cyclic number.

It is not a de Polignac number, because 505016716681 - 2²⁹ = 504479845769 is a prime.

It is a super-2 number, since 2×505016716681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505016716601) 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, 120996 + ... + 1012261.

It is an arithmetic number, because the mean of its divisors is an integer number (126254573893).

Almost surely, 2^505016716681 is an apocalyptic number.

It is an amenable number.

505016716681 is a deficient number, since it is larger than the sum of its proper divisors (1578891).

505016716681 is a wasteful number, since it uses less digits than its factorization.

505016716681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578890.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 505016716681 in words is "five hundred five billion, sixteen million, seven hundred sixteen thousand, six hundred eighty-one".