2161306663553 has 4 divisors (see below), whose sum is σ = 2161432316208. Its totient is φ = 2161181010900.

The previous prime is 2161306663487. The next prime is 2161306663591. The reversal of 2161306663553 is 3553666031612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2161306663553 - 2²⁴ = 2161289886337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161306663498 and 2161306663507.

It is not an unprimeable number, because it can be changed into a prime (2161306662553) 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, 62800523 + ... + 62834928.

It is an arithmetic number, because the mean of its divisors is an integer number (540358079052).

Almost surely, 2^{2161306663553} is an apocalyptic number.

It is an amenable number.

2161306663553 is a deficient number, since it is larger than the sum of its proper divisors (125652655).

2161306663553 is a wasteful number, since it uses less digits than its factorization.

2161306663553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125652654.

The product of its (nonzero) digits is 1749600, while the sum is 47.

The spelling of 2161306663553 in words is "two trillion, one hundred sixty-one billion, three hundred six million, six hundred sixty-three thousand, five hundred fifty-three".