651531265656 has 64 divisors (see below), whose sum is σ = 1724755589280. Its totient is φ = 204388454400.

The previous prime is 651531265633. The next prime is 651531265687. The reversal of 651531265656 is 656562135156.

It is a super-2 number, since 2×651531265656² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 651531265599 and 651531265608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7423180 + ... + 7510436.

Almost surely, 2^651531265656 is an apocalyptic number.

It is an amenable number.

651531265656 is an abundant number, since it is smaller than the sum of its proper divisors (1073224323624).

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

651531265656 is a wasteful number, since it uses less digits than its factorization.

651531265656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105584 (or 105580 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 51.

The spelling of 651531265656 in words is "six hundred fifty-one billion, five hundred thirty-one million, two hundred sixty-five thousand, six hundred fifty-six".