663531655021242 has 64 divisors (see below), whose sum is σ = 1549373938237440. Its totient is φ = 185491605211776.

The previous prime is 663531655021229. The next prime is 663531655021259. The reversal of 663531655021242 is 242120556135366.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43404403 + ... + 56665734.

It is an arithmetic number, because the mean of its divisors is an integer number (24208967784960).

Almost surely, 2^{663531655021242} is an apocalyptic number.

663531655021242 is an abundant number, since it is smaller than the sum of its proper divisors (885842283216198).

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

663531655021242 is a wasteful number, since it uses less digits than its factorization.

663531655021242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100073555.

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 663531655021242 in words is "six hundred sixty-three trillion, five hundred thirty-one billion, six hundred fifty-five million, twenty-one thousand, two hundred forty-two".