165561151101576 has 128 divisors (see below), whose sum is σ = 435488349542400. Its totient is φ = 52382147973120.

The previous prime is 165561151101529. The next prime is 165561151101581. The reversal of 165561151101576 is 675101151165561.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 538065660 + ... + 538373268.

It is an arithmetic number, because the mean of its divisors is an integer number (3402252730800).

Almost surely, 2^{165561151101576} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165561151101576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217744174771200).

165561151101576 is an abundant number, since it is smaller than the sum of its proper divisors (269927198440824).

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

165561151101576 is a wasteful number, since it uses less digits than its factorization.

165561151101576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322479 (or 322475 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 51.

The spelling of 165561151101576 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty-one million, one hundred one thousand, five hundred seventy-six".