642635540224 has 18 divisors (see below), whose sum is σ = 1282760785880. Its totient is φ = 321317769984.

The previous prime is 642635540213. The next prime is 642635540231. The reversal of 642635540224 is 422045536246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1255147284 + ... + 1255147795.

Almost surely, 2^642635540224 is an apocalyptic number.

642635540224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

642635540224 is a deficient number, since it is larger than the sum of its proper divisors (640125245656).

642635540224 is an equidigital number, since it uses as much as digits as its factorization.

642635540224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510295095 (or 2510295081 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 43.

The spelling of 642635540224 in words is "six hundred forty-two billion, six hundred thirty-five million, five hundred forty thousand, two hundred twenty-four".