165747172530 has 32 divisors (see below), whose sum is σ = 397943685504. Its totient is φ = 44182526976.

The previous prime is 165747172477. The next prime is 165747172537. The reversal of 165747172530 is 35271747561.

It is a self number, because there is not a number n which added to its sum of digits gives 165747172530.

It is not an unprimeable number, because it can be changed into a prime (165747172537) 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, 964207 + ... + 1123026.

It is an arithmetic number, because the mean of its divisors is an integer number (12435740172).

Almost surely, 2^165747172530 is an apocalyptic number.

165747172530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165747172530 is an abundant number, since it is smaller than the sum of its proper divisors (232196512974).

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

165747172530 is a wasteful number, since it uses less digits than its factorization.

165747172530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089890.

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 165747172530 in words is "one hundred sixty-five billion, seven hundred forty-seven million, one hundred seventy-two thousand, five hundred thirty".