661759225600 has 108 divisors (see below), whose sum is σ = 1786862899080. Its totient is φ = 240639692800.

The previous prime is 661759225541. The next prime is 661759225627. The reversal of 661759225600 is 6522957166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4629595 + ... + 4770394.

Almost surely, 2^661759225600 is an apocalyptic number.

It is an amenable number.

661759225600 is an abundant number, since it is smaller than the sum of its proper divisors (1125103673480).

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

661759225600 is a wasteful number, since it uses less digits than its factorization.

661759225600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400026 (or 9400007 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 661759225600 in words is "six hundred sixty-one billion, seven hundred fifty-nine million, two hundred twenty-five thousand, six hundred".