166615356755 has 4 divisors (see below), whose sum is σ = 199938428112. Its totient is φ = 133292285400.

The previous prime is 166615356727. The next prime is 166615356793. The reversal of 166615356755 is 557653516661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166615356755 - 2²⁶ = 166548247891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166615356755.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16661535671 + ... + 16661535680.

It is an arithmetic number, because the mean of its divisors is an integer number (49984607028).

Almost surely, 2^166615356755 is an apocalyptic number.

166615356755 is a deficient number, since it is larger than the sum of its proper divisors (33323071357).

166615356755 is an equidigital number, since it uses as much as digits as its factorization.

166615356755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33323071356.

The product of its digits is 17010000, while the sum is 56.

The spelling of 166615356755 in words is "one hundred sixty-six billion, six hundred fifteen million, three hundred fifty-six thousand, seven hundred fifty-five".