656066221600 has 72 divisors (see below), whose sum is σ = 1607281658640. Its totient is φ = 261499096320.

The previous prime is 656066221571. The next prime is 656066221607. The reversal of 656066221600 is 6122660656.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (656066221607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1222510 + ... + 1675309.

It is an arithmetic number, because the mean of its divisors is an integer number (22323356370).

Almost surely, 2^656066221600 is an apocalyptic number.

It is an amenable number.

656066221600 is an abundant number, since it is smaller than the sum of its proper divisors (951215437040).

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

656066221600 is a wasteful number, since it uses less digits than its factorization.

656066221600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898122 (or 2898109 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 656066221600 in words is "six hundred fifty-six billion, sixty-six million, two hundred twenty-one thousand, six hundred".