165566606255520 has 96 divisors (see below), whose sum is σ = 521660275411968. Its totient is φ = 44140473566208.

The previous prime is 165566606255507. The next prime is 165566606255539. The reversal of 165566606255520 is 25552606665561.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×165566606255520² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39492544 + ... + 43483263.

It is an arithmetic number, because the mean of its divisors is an integer number (5433961202208).

Almost surely, 2^{165566606255520} is an apocalyptic number.

165566606255520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165566606255520 is an abundant number, since it is smaller than the sum of its proper divisors (356093669156448).

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

165566606255520 is a wasteful number, since it uses less digits than its factorization.

165566606255520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82979982 (or 82979974 counting only the distinct ones).

The product of its (nonzero) digits is 97200000, while the sum is 60.

The spelling of 165566606255520 in words is "one hundred sixty-five trillion, five hundred sixty-six billion, six hundred six million, two hundred fifty-five thousand, five hundred twenty".