642246665124 has 24 divisors (see below), whose sum is σ = 1516630681440. Its totient is φ = 211502917504.

The previous prime is 642246665089. The next prime is 642246665131. The reversal of 642246665124 is 421566642246.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322411989 + ... + 322413980.

It is an arithmetic number, because the mean of its divisors is an integer number (63192945060).

Almost surely, 2^642246665124 is an apocalyptic number.

It is an amenable number.

642246665124 is an abundant number, since it is smaller than the sum of its proper divisors (874384016316).

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

642246665124 is a wasteful number, since it uses less digits than its factorization.

642246665124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644826059 (or 644826057 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 48.

The spelling of 642246665124 in words is "six hundred forty-two billion, two hundred forty-six million, six hundred sixty-five thousand, one hundred twenty-four".