642388040184 has 32 divisors (see below), whose sum is σ = 1751967383040. Its totient is φ = 194663042400.

The previous prime is 642388040159. The next prime is 642388040317. The reversal of 642388040184 is 481040883246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216643752 + ... + 1216644279.

It is an arithmetic number, because the mean of its divisors is an integer number (54748980720).

Almost surely, 2^642388040184 is an apocalyptic number.

It is an amenable number.

642388040184 is an abundant number, since it is smaller than the sum of its proper divisors (1109579342856).

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

642388040184 is a wasteful number, since it uses less digits than its factorization.

642388040184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433288051 (or 2433288047 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 48.

The spelling of 642388040184 in words is "six hundred forty-two billion, three hundred eighty-eight million, forty thousand, one hundred eighty-four".