64631813646 has 32 divisors (see below), whose sum is σ = 131767741440. Its totient is φ = 21126988064.

The previous prime is 64631813599. The next prime is 64631813651.

64631813646 is nontrivially palindromic in base 10.

64631813646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64631813595 and 64631813604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606775 + ... + 705293.

It is an arithmetic number, because the mean of its divisors is an integer number (4117741920).

Almost surely, 2^64631813646 is an apocalyptic number.

64631813646 is an abundant number, since it is smaller than the sum of its proper divisors (67135927794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64631813646 is a wasteful number, since it uses less digits than its factorization.

64631813646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100640.

The product of its digits is 1492992, while the sum is 48.

The spelling of 64631813646 in words is "sixty-four billion, six hundred thirty-one million, eight hundred thirteen thousand, six hundred forty-six".