642666257888 has 24 divisors (see below), whose sum is σ = 1265289759720. Its totient is φ = 321322826880.

The previous prime is 642666257837. The next prime is 642666257911. The reversal of 642666257888 is 888752666246.

642666257888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746303 + ... + 1357313.

It is an arithmetic number, because the mean of its divisors is an integer number (52720406655).

Almost surely, 2^642666257888 is an apocalyptic number.

It is an amenable number.

642666257888 is a deficient number, since it is larger than the sum of its proper divisors (622623501832).

642666257888 is a wasteful number, since it uses less digits than its factorization.

642666257888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643890 (or 643882 counting only the distinct ones).

The product of its digits is 371589120, while the sum is 68.

The spelling of 642666257888 in words is "six hundred forty-two billion, six hundred sixty-six million, two hundred fifty-seven thousand, eight hundred eighty-eight".