165565651516556 has 24 divisors (see below), whose sum is σ = 299090892777600. Its totient is φ = 80111192054400.

The previous prime is 165565651516547. The next prime is 165565651516561. The reversal of 165565651516556 is 655615156565561.

It is a super-2 number, since 2×165565651516556² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1964231 + ... + 18302718.

It is an arithmetic number, because the mean of its divisors is an integer number (12462120532400).

Almost surely, 2^{165565651516556} is an apocalyptic number.

It is an amenable number.

165565651516556 is a deficient number, since it is larger than the sum of its proper divisors (133525241261044).

165565651516556 is a wasteful number, since it uses less digits than its factorization.

165565651516556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20332865 (or 20332863 counting only the distinct ones).

The product of its digits is 607500000, while the sum is 68.

The spelling of 165565651516556 in words is "one hundred sixty-five trillion, five hundred sixty-five billion, six hundred fifty-one million, five hundred sixteen thousand, five hundred fifty-six".