166591612818579 has 32 divisors (see below), whose sum is σ = 253409511700800. Its totient is φ = 96437943078912.

The previous prime is 166591612818563. The next prime is 166591612818593. The reversal of 166591612818579 is 975818216195661.

166591612818579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166591612818579 - 2⁴ = 166591612818563 is a prime.

It is a super-2 number, since 2×166591612818579² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166591612818579.

It is not an unprimeable number, because it can be changed into a prime (166591612818509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63168922 + ... + 65753295.

It is an arithmetic number, because the mean of its divisors is an integer number (7919047240650).

Almost surely, 2^{166591612818579} is an apocalyptic number.

166591612818579 is a deficient number, since it is larger than the sum of its proper divisors (86817898882221).

166591612818579 is a wasteful number, since it uses less digits than its factorization.

166591612818579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128924199.

The product of its digits is 391910400, while the sum is 75.

The spelling of 166591612818579 in words is "one hundred sixty-six trillion, five hundred ninety-one billion, six hundred twelve million, eight hundred eighteen thousand, five hundred seventy-nine".