639354044634 has 8 divisors (see below), whose sum is σ = 1278708089280. Its totient is φ = 213118014876.

The previous prime is 639354044621. The next prime is 639354044677. The reversal of 639354044634 is 436440453936.

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

639354044634 is an admirable 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, 53279503714 + ... + 53279503725.

It is an arithmetic number, because the mean of its divisors is an integer number (159838511160).

Almost surely, 2^639354044634 is an apocalyptic number.

639354044634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

639354044634 is a wasteful number, since it uses less digits than its factorization.

639354044634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106559007444.

The product of its (nonzero) digits is 11197440, while the sum is 51.

The spelling of 639354044634 in words is "six hundred thirty-nine billion, three hundred fifty-four million, forty-four thousand, six hundred thirty-four".