639574640042 has 16 divisors (see below), whose sum is σ = 1033287223752. Its totient is φ = 295151669760.

The previous prime is 639574640039. The next prime is 639574640053. The reversal of 639574640042 is 240046475936.

639574640042 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 4 ways, for example, as 162023155441 + 477551484601 = 402521^2 + 691051^2 .

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, 1311923 + ... + 1732134.

Almost surely, 2^639574640042 is an apocalyptic number.

639574640042 is a deficient number, since it is larger than the sum of its proper divisors (393712583710).

639574640042 is a wasteful number, since it uses less digits than its factorization.

639574640042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052153.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 639574640042 in words is "six hundred thirty-nine billion, five hundred seventy-four million, six hundred forty thousand, forty-two".