165615161510538 has 24 divisors (see below), whose sum is σ = 367177799939808. Its totient is φ = 53921215375272.

The previous prime is 165615161510527. The next prime is 165615161510551. The reversal of 165615161510538 is 835015161516561.

165615161510538 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 1 + 5 + 1 + 615 + 10 + 5 + 3 + 8 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106986537670 + ... + 106986539217.

It is an arithmetic number, because the mean of its divisors is an integer number (15299074997492).

Almost surely, 2^{165615161510538} is an apocalyptic number.

165615161510538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165615161510538 is an abundant number, since it is smaller than the sum of its proper divisors (201562638429270).

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

165615161510538 is a wasteful number, since it uses less digits than its factorization.

165615161510538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213973076938 (or 213973076935 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 54.

The spelling of 165615161510538 in words is "one hundred sixty-five trillion, six hundred fifteen billion, one hundred sixty-one million, five hundred ten thousand, five hundred thirty-eight".