66564154715 has 16 divisors (see below), whose sum is σ = 80019835200. Its totient is φ = 53156164992.

The previous prime is 66564154673. The next prime is 66564154777. The reversal of 66564154715 is 51745146566.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66564154715 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12825341 + ... + 12830529.

It is an arithmetic number, because the mean of its divisors is an integer number (5001239700).

Almost surely, 2^66564154715 is an apocalyptic number.

66564154715 is a deficient number, since it is larger than the sum of its proper divisors (13455680485).

66564154715 is a wasteful number, since it uses less digits than its factorization.

66564154715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9286.

The product of its digits is 3024000, while the sum is 50.

The spelling of 66564154715 in words is "sixty-six billion, five hundred sixty-four million, one hundred fifty-four thousand, seven hundred fifteen".