165015550161057 has 4 divisors (see below), whose sum is σ = 220020733548080. Its totient is φ = 110010366774036.

The previous prime is 165015550161041. The next prime is 165015550161113. The reversal of 165015550161057 is 750161055510561.

165015550161057 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 165015550161057 - 2⁴ = 165015550161041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165015550160997 and 165015550161015.

It is not an unprimeable number, because it can be changed into a prime (165015550160057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27502591693507 + ... + 27502591693512.

It is an arithmetic number, because the mean of its divisors is an integer number (55005183387020).

Almost surely, 2^{165015550161057} is an apocalyptic number.

It is an amenable number.

165015550161057 is a deficient number, since it is larger than the sum of its proper divisors (55005183387023).

165015550161057 is an equidigital number, since it uses as much as digits as its factorization.

165015550161057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55005183387022.

The product of its (nonzero) digits is 787500, while the sum is 48.

The spelling of 165015550161057 in words is "one hundred sixty-five trillion, fifteen billion, five hundred fifty million, one hundred sixty-one thousand, fifty-seven".