639771292874 has 8 divisors (see below), whose sum is σ = 1096750787808. Its totient is φ = 274187696940.

The previous prime is 639771292873. The next prime is 639771292913. The reversal of 639771292874 is 478292177936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 639771292874.

It is not an unprimeable number, because it can be changed into a prime (639771292873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22848974732 + ... + 22848974759.

It is an arithmetic number, because the mean of its divisors is an integer number (137093848476).

Almost surely, 2^639771292874 is an apocalyptic number.

639771292874 is a deficient number, since it is larger than the sum of its proper divisors (456979494934).

639771292874 is a wasteful number, since it uses less digits than its factorization.

639771292874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45697949500.

The product of its digits is 64012032, while the sum is 65.

The spelling of 639771292874 in words is "six hundred thirty-nine billion, seven hundred seventy-one million, two hundred ninety-two thousand, eight hundred seventy-four".