64631131772 has 12 divisors (see below), whose sum is σ = 113351977200. Its totient is φ = 32244852576.

The previous prime is 64631131753. The next prime is 64631131813. The reversal of 64631131772 is 27713113646.

64631131772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17676272 + ... + 17679927.

It is an arithmetic number, because the mean of its divisors is an integer number (9445998100).

Almost surely, 2^64631131772 is an apocalyptic number.

It is an amenable number.

64631131772 is a deficient number, since it is larger than the sum of its proper divisors (48720845428).

64631131772 is a wasteful number, since it uses less digits than its factorization.

64631131772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35356660 (or 35356658 counting only the distinct ones).

The product of its digits is 127008, while the sum is 41.

The spelling of 64631131772 in words is "sixty-four billion, six hundred thirty-one million, one hundred thirty-one thousand, seven hundred seventy-two".