64640767172 has 12 divisors (see below), whose sum is σ = 113141059500. Its totient is φ = 32314750176.

The previous prime is 64640767171. The next prime is 64640767183. The reversal of 64640767172 is 27176704646.

64640767172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7010043076 + 57630724096 = 83726^2 + 240064^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64640767172.

It is not an unprimeable number, because it can be changed into a prime (64640767171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382483 + ... + 1428474.

It is an arithmetic number, because the mean of its divisors is an integer number (9428421625).

Almost surely, 2^64640767172 is an apocalyptic number.

It is an amenable number.

64640767172 is a deficient number, since it is larger than the sum of its proper divisors (48500292328).

64640767172 is a wasteful number, since it uses less digits than its factorization.

64640767172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816710 (or 2816708 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 50.

The spelling of 64640767172 in words is "sixty-four billion, six hundred forty million, seven hundred sixty-seven thousand, one hundred seventy-two".