651605650660 has 12 divisors (see below), whose sum is σ = 1368371866428. Its totient is φ = 260642260256.

The previous prime is 651605650609. The next prime is 651605650679. The reversal of 651605650660 is 66056506156.

It can be written as a sum of positive squares in 2 ways, for example, as 350729266176 + 300876384484 = 592224^2 + 548522^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 651605650660.

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, 16290141247 + ... + 16290141286.

It is an arithmetic number, because the mean of its divisors is an integer number (114030988869).

Almost surely, 2^651605650660 is an apocalyptic number.

It is an amenable number.

651605650660 is an abundant number, since it is smaller than the sum of its proper divisors (716766215768).

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

651605650660 is a wasteful number, since it uses less digits than its factorization.

651605650660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32580282542 (or 32580282540 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 651605650660 in words is "six hundred fifty-one billion, six hundred five million, six hundred fifty thousand, six hundred sixty".