165981770675490 has 96 divisors (see below), whose sum is σ = 505520732407104. Its totient is φ = 34489718578560.

The previous prime is 165981770675477. The next prime is 165981770675563. The reversal of 165981770675490 is 94576077189561.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5132382429 + ... + 5132414768.

It is an arithmetic number, because the mean of its divisors is an integer number (5265840962574).

Almost surely, 2^{165981770675490} is an apocalyptic number.

165981770675490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165981770675490 is an abundant number, since it is smaller than the sum of its proper divisors (339538961731614).

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

165981770675490 is a wasteful number, since it uses less digits than its factorization.

165981770675490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10264797232 (or 10264797225 counting only the distinct ones).

The product of its (nonzero) digits is 800150400, while the sum is 75.

The spelling of 165981770675490 in words is "one hundred sixty-five trillion, nine hundred eighty-one billion, seven hundred seventy million, six hundred seventy-five thousand, four hundred ninety".