651256516650 has 24 divisors (see below), whose sum is σ = 1615116161664. Its totient is φ = 173668404400.

The previous prime is 651256516613. The next prime is 651256516681. The reversal of 651256516650 is 56615652156.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 651256516650.

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 11 ways as a sum of consecutive naturals, for example, 2170854906 + ... + 2170855205.

It is an arithmetic number, because the mean of its divisors is an integer number (67296506736).

Almost surely, 2^651256516650 is an apocalyptic number.

651256516650 is an abundant number, since it is smaller than the sum of its proper divisors (963859645014).

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

651256516650 is a wasteful number, since it uses less digits than its factorization.

651256516650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4341710126 (or 4341710121 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 48.

The spelling of 651256516650 in words is "six hundred fifty-one billion, two hundred fifty-six million, five hundred sixteen thousand, six hundred fifty".