165193951023 has 12 divisors (see below), whose sum is σ = 245062498408. Its totient is φ = 107152832880.

The previous prime is 165193950967. The next prime is 165193951073. The reversal of 165193951023 is 320159391561.

165193951023 is a `hidden beast` number, since 16 + 519 + 3 + 95 + 10 + 23 = 666.

It is not a de Polignac number, because 165193951023 - 2¹² = 165193946927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165193951023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165193951073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248038633 + ... + 248039298.

Almost surely, 2^165193951023 is an apocalyptic number.

165193951023 is a deficient number, since it is larger than the sum of its proper divisors (79868547385).

165193951023 is a wasteful number, since it uses less digits than its factorization.

165193951023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496077974 (or 496077971 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The spelling of 165193951023 in words is "one hundred sixty-five billion, one hundred ninety-three million, nine hundred fifty-one thousand, twenty-three".