64664147655 has 48 divisors (see below), whose sum is σ = 116644207680. Its totient is φ = 33098817024.

The previous prime is 64664147651. The next prime is 64664147671. The reversal of 64664147655 is 55674146646.

64664147655 is a `hidden beast` number, since 64 + 6 + 64 + 1 + 476 + 55 = 666.

64664147655 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 64664147655 - 2² = 64664147651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664147651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69579 + ... + 366291.

It is an arithmetic number, because the mean of its divisors is an integer number (2430087660).

Almost surely, 2^64664147655 is an apocalyptic number.

64664147655 is a deficient number, since it is larger than the sum of its proper divisors (51980060025).

64664147655 is a wasteful number, since it uses less digits than its factorization.

64664147655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296920 (or 296917 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The spelling of 64664147655 in words is "sixty-four billion, six hundred sixty-four million, one hundred forty-seven thousand, six hundred fifty-five".