64675657646 has 16 divisors (see below), whose sum is σ = 97985204928. Its totient is φ = 32013996000.

The previous prime is 64675657637. The next prime is 64675657661.

64675657646 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×64675657646² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2924651 + ... + 2946681.

It is an arithmetic number, because the mean of its divisors is an integer number (6124075308).

Almost surely, 2^64675657646 is an apocalyptic number.

64675657646 is a deficient number, since it is larger than the sum of its proper divisors (33309547282).

64675657646 is a wasteful number, since it uses less digits than its factorization.

64675657646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36667.

The product of its digits is 152409600, while the sum is 62.

The spelling of 64675657646 in words is "sixty-four billion, six hundred seventy-five million, six hundred fifty-seven thousand, six hundred forty-six".