663022721660 has 24 divisors (see below), whose sum is σ = 1499451386496. Its totient is φ = 244808389440.

The previous prime is 663022721609. The next prime is 663022721677. The reversal of 663022721660 is 66127220366.

It is a congruent number.

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, 1275043436 + ... + 1275043955.

It is an arithmetic number, because the mean of its divisors is an integer number (62477141104).

Almost surely, 2^663022721660 is an apocalyptic number.

It is an amenable number.

663022721660 is an abundant number, since it is smaller than the sum of its proper divisors (836428664836).

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

663022721660 is a wasteful number, since it uses less digits than its factorization.

663022721660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550087413 (or 2550087411 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 663022721660 in words is "six hundred sixty-three billion, twenty-two million, seven hundred twenty-one thousand, six hundred sixty".