168531516657 has 48 divisors (see below), whose sum is σ = 282506004352. Its totient is φ = 94818366720.

The previous prime is 168531516641. The next prime is 168531516667. The reversal of 168531516657 is 756615135861.

168531516657 is a `hidden beast` number, since 1 + 6 + 8 + 531 + 51 + 6 + 6 + 57 = 666.

It is not a de Polignac number, because 168531516657 - 2⁴ = 168531516641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168531516607) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9365853 + ... + 9383829.

Almost surely, 2^168531516657 is an apocalyptic number.

It is an amenable number.

168531516657 is a deficient number, since it is larger than the sum of its proper divisors (113974487695).

168531516657 is a wasteful number, since it uses less digits than its factorization.

168531516657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20278 (or 20275 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 54.

The spelling of 168531516657 in words is "one hundred sixty-eight billion, five hundred thirty-one million, five hundred sixteen thousand, six hundred fifty-seven".