642615734544 has 80 divisors (see below), whose sum is σ = 1958447984640. Its totient is φ = 177681767040.

The previous prime is 642615734543. The next prime is 642615734597. The reversal of 642615734544 is 445437516246.

It is not an unprimeable number, because it can be changed into a prime (642615734543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30837114 + ... + 30857945.

It is an arithmetic number, because the mean of its divisors is an integer number (24480599808).

Almost surely, 2^642615734544 is an apocalyptic number.

It is an amenable number.

642615734544 is an abundant number, since it is smaller than the sum of its proper divisors (1315832250096).

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

642615734544 is a wasteful number, since it uses less digits than its factorization.

642615734544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61695108 (or 61695102 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 51.

The spelling of 642615734544 in words is "six hundred forty-two billion, six hundred fifteen million, seven hundred thirty-four thousand, five hundred forty-four".