651320821272 has 32 divisors (see below), whose sum is σ = 1776329513280. Its totient is φ = 197369945760.

The previous prime is 651320821259. The next prime is 651320821273. The reversal of 651320821272 is 272128023156.

651320821272 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 651320821272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651320821273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1233561898 + ... + 1233562425.

It is an arithmetic number, because the mean of its divisors is an integer number (55510297290).

Almost surely, 2^651320821272 is an apocalyptic number.

It is an amenable number.

651320821272 is an abundant number, since it is smaller than the sum of its proper divisors (1125008692008).

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

651320821272 is a wasteful number, since it uses less digits than its factorization.

651320821272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2467124343 (or 2467124339 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 651320821272 in words is "six hundred fifty-one billion, three hundred twenty million, eight hundred twenty-one thousand, two hundred seventy-two".