651655056664 has 64 divisors (see below), whose sum is σ = 1308733848000. Its totient is φ = 303114240000.

The previous prime is 651655056653. The next prime is 651655056677. The reversal of 651655056664 is 466650556156.

651655056664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×651655056664² (a number of 24 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 15 ways as a sum of consecutive naturals, for example, 8188264 + ... + 8267464.

It is an arithmetic number, because the mean of its divisors is an integer number (20448966375).

Almost surely, 2^651655056664 is an apocalyptic number.

It is an amenable number.

651655056664 is an abundant number, since it is smaller than the sum of its proper divisors (657078791336).

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

651655056664 is a wasteful number, since it uses less digits than its factorization.

651655056664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79924 (or 79920 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 55.

The spelling of 651655056664 in words is "six hundred fifty-one billion, six hundred fifty-five million, fifty-six thousand, six hundred sixty-four".