165611075500 has 48 divisors (see below), whose sum is σ = 389517264864. Its totient is φ = 61148702400.

The previous prime is 165611075471. The next prime is 165611075501. The reversal of 165611075500 is 5570116561.

It is a self number, because there is not a number n which added to its sum of digits gives 165611075500.

It is not an unprimeable number, because it can be changed into a prime (165611075501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12732814 + ... + 12745813.

It is an arithmetic number, because the mean of its divisors is an integer number (8114943018).

Almost surely, 2^165611075500 is an apocalyptic number.

165611075500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165611075500 is an abundant number, since it is smaller than the sum of its proper divisors (223906189364).

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

165611075500 is a wasteful number, since it uses less digits than its factorization.

165611075500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25478659 (or 25478647 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 37.

The spelling of 165611075500 in words is "one hundred sixty-five billion, six hundred eleven million, seventy-five thousand, five hundred".