66564612255 has 32 divisors (see below), whose sum is σ = 112535216640. Its totient is φ = 33504727680.

The previous prime is 66564612251. The next prime is 66564612263. The reversal of 66564612255 is 55221646566.

It is not a de Polignac number, because 66564612255 - 2² = 66564612251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564612251) 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, 369076 + ... + 518985.

It is an arithmetic number, because the mean of its divisors is an integer number (3516725520).

Almost surely, 2^66564612255 is an apocalyptic number.

66564612255 is a deficient number, since it is larger than the sum of its proper divisors (45970604385).

66564612255 is a wasteful number, since it uses less digits than its factorization.

66564612255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888351.

The product of its digits is 2592000, while the sum is 48.

The spelling of 66564612255 in words is "sixty-six billion, five hundred sixty-four million, six hundred twelve thousand, two hundred fifty-five".