165693745728 has 168 divisors, whose sum is σ = 557448711872. Its totient is φ = 46061540352.

The previous prime is 165693745697. The next prime is 165693745733. The reversal of 165693745728 is 827547396561.

165693745728 is a `hidden beast` number, since 1 + 6 + 56 + 9 + 3 + 7 + 4 + 572 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 406150 + ... + 704517.

Almost surely, 2^165693745728 is an apocalyptic number.

165693745728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

165693745728 is an abundant number, since it is smaller than the sum of its proper divisors (391754966144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165693745728 is a wasteful number, since it uses less digits than its factorization.

165693745728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110729 (or 1110716 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 63.

The spelling of 165693745728 in words is "one hundred sixty-five billion, six hundred ninety-three million, seven hundred forty-five thousand, seven hundred twenty-eight".