642744178484 has 6 divisors (see below), whose sum is σ = 1124802312354. Its totient is φ = 321372089240.

The previous prime is 642744178477. The next prime is 642744178501. The reversal of 642744178484 is 484871447246.

642744178484 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 636768888484 + 5975290000 = 797978^2 + 77300^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80343022307 + ... + 80343022314.

It is an arithmetic number, because the mean of its divisors is an integer number (187467052059).

Almost surely, 2^642744178484 is an apocalyptic number.

It is an amenable number.

642744178484 is a deficient number, since it is larger than the sum of its proper divisors (482058133870).

642744178484 is a wasteful number, since it uses less digits than its factorization.

642744178484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160686044625 (or 160686044623 counting only the distinct ones).

The product of its digits is 38535168, while the sum is 59.

The spelling of 642744178484 in words is "six hundred forty-two billion, seven hundred forty-four million, one hundred seventy-eight thousand, four hundred eighty-four".