64946631957 has 8 divisors (see below), whose sum is σ = 89581561440. Its totient is φ = 41804728560.

The previous prime is 64946631943. The next prime is 64946632019. The reversal of 64946631957 is 75913664946.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64946631957 - 2⁴ = 64946631941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64946631957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64946631907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373256419 + ... + 373256592.

It is an arithmetic number, because the mean of its divisors is an integer number (11197695180).

Almost surely, 2^64946631957 is an apocalyptic number.

It is an amenable number.

64946631957 is a deficient number, since it is larger than the sum of its proper divisors (24634929483).

64946631957 is a wasteful number, since it uses less digits than its factorization.

64946631957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746513043.

The product of its digits is 29393280, while the sum is 60.

The spelling of 64946631957 in words is "sixty-four billion, nine hundred forty-six million, six hundred thirty-one thousand, nine hundred fifty-seven".