166177064563 has 4 divisors (see below), whose sum is σ = 166229605528. Its totient is φ = 166124523600.

The previous prime is 166177064561. The next prime is 166177064579. The reversal of 166177064563 is 365460771661.

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

It is a cyclic number.

It is not a de Polignac number, because 166177064563 - 2¹ = 166177064561 is a prime.

It is a super-2 number, since 2×166177064563² (a number of 23 digits) contains 22 as substring.

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 166177064563.

It is not an unprimeable number, because it can be changed into a prime (166177064561) 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, 26265738 + ... + 26272063.

It is an arithmetic number, because the mean of its divisors is an integer number (41557401382).

Almost surely, 2^166177064563 is an apocalyptic number.

166177064563 is a deficient number, since it is larger than the sum of its proper divisors (52540965).

166177064563 is an equidigital number, since it uses as much as digits as its factorization.

166177064563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52540964.

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 166177064563 in words is "one hundred sixty-six billion, one hundred seventy-seven million, sixty-four thousand, five hundred sixty-three".