15506616165161 has 4 divisors (see below), whose sum is σ = 16916308543824. Its totient is φ = 14096923786500.

The previous prime is 15506616165149. The next prime is 15506616165193. The reversal of 15506616165161 is 16156161660551.

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 15506616165161 - 2⁶ = 15506616165097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15506616155161) 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, 704846189315 + ... + 704846189336.

It is an arithmetic number, because the mean of its divisors is an integer number (4229077135956).

Almost surely, 2^{15506616165161} is an apocalyptic number.

15506616165161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15506616165161 is a deficient number, since it is larger than the sum of its proper divisors (1409692378663).

15506616165161 is a wasteful number, since it uses less digits than its factorization.

15506616165161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409692378662.

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 15506616165161 in words is "fifteen trillion, five hundred six billion, six hundred sixteen million, one hundred sixty-five thousand, one hundred sixty-one".