639705257254 has 8 divisors (see below), whose sum is σ = 1096637583888. Its totient is φ = 274159395960.

The previous prime is 639705257227. The next prime is 639705257281. The reversal of 639705257254 is 452752507936.

639705257254 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (639705257227) and next prime (639705257281).

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

It is a junction number, because it is equal to n+sod(n) for n = 639705257195 and 639705257204.

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, 22846616317 + ... + 22846616344.

It is an arithmetic number, because the mean of its divisors is an integer number (137079697986).

Almost surely, 2^639705257254 is an apocalyptic number.

639705257254 is a deficient number, since it is larger than the sum of its proper divisors (456932326634).

639705257254 is a wasteful number, since it uses less digits than its factorization.

639705257254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45693232670.

The product of its (nonzero) digits is 15876000, while the sum is 55.

The spelling of 639705257254 in words is "six hundred thirty-nine billion, seven hundred five million, two hundred fifty-seven thousand, two hundred fifty-four".