664521224521504 has 48 divisors (see below), whose sum is σ = 1525686484896000. Its totient is φ = 284794810504512.

The previous prime is 664521224521447. The next prime is 664521224521513. The reversal of 664521224521504 is 405125422125466.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30271546264 + ... + 30271568215.

It is an arithmetic number, because the mean of its divisors is an integer number (31785135102000).

Almost surely, 2^{664521224521504} is an apocalyptic number.

It is an amenable number.

664521224521504 is an abundant number, since it is smaller than the sum of its proper divisors (861165260374496).

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

664521224521504 is an equidigital number, since it uses as much as digits as its factorization.

664521224521504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60543114510 (or 60543114488 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 49.

The spelling of 664521224521504 in words is "six hundred sixty-four trillion, five hundred twenty-one billion, two hundred twenty-four million, five hundred twenty-one thousand, five hundred four".