64578664857 has 16 divisors (see below), whose sum is σ = 100018792832. Its totient is φ = 36297141120.

The previous prime is 64578664837. The next prime is 64578664873. The reversal of 64578664857 is 75846687546.

It is not a de Polignac number, because 64578664857 - 2¹¹ = 64578662809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64578664837) 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, 25205068 + ... + 25207629.

It is an arithmetic number, because the mean of its divisors is an integer number (6251174552).

Almost surely, 2^64578664857 is an apocalyptic number.

It is an amenable number.

64578664857 is a deficient number, since it is larger than the sum of its proper divisors (35440127975).

64578664857 is a wasteful number, since it uses less digits than its factorization.

64578664857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50412768.

The product of its digits is 270950400, while the sum is 66.

The spelling of 64578664857 in words is "sixty-four billion, five hundred seventy-eight million, six hundred sixty-four thousand, eight hundred fifty-seven".