667665055 has 16 divisors (see below), whose sum is σ = 856574784. Its totient is φ = 497825280.

The previous prime is 667665049. The next prime is 667665059. The reversal of 667665055 is 550566766.

It is not a de Polignac number, because 667665055 - 2⁵ = 667665023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667664996 and 667665014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667665059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29376 + ... + 46885.

It is an arithmetic number, because the mean of its divisors is an integer number (53535924).

Almost surely, 2^667665055 is an apocalyptic number.

667665055 is a deficient number, since it is larger than the sum of its proper divisors (188909729).

667665055 is a wasteful number, since it uses less digits than its factorization.

667665055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76386.

The product of its (nonzero) digits is 1134000, while the sum is 46.

The square root of 667665055 is about 25839.2154486161. The cubic root of 667665055 is about 874.0163334976.

The spelling of 667665055 in words is "six hundred sixty-seven million, six hundred sixty-five thousand, fifty-five".