639546220442 has 8 divisors (see below), whose sum is σ = 959336653332. Its totient is φ = 319767336000.

The previous prime is 639546220399. The next prime is 639546220501. The reversal of 639546220442 is 244022645936.

It can be written as a sum of positive squares in 2 ways, for example, as 499115403361 + 140430817081 = 706481^2 + 374741^2 .

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

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, 2747309 + ... + 2970992.

Almost surely, 2^639546220442 is an apocalyptic number.

639546220442 is a deficient number, since it is larger than the sum of its proper divisors (319790432890).

639546220442 is a wasteful number, since it uses less digits than its factorization.

639546220442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5774224.

The product of its (nonzero) digits is 2488320, while the sum is 47.

The spelling of 639546220442 in words is "six hundred thirty-nine billion, five hundred forty-six million, two hundred twenty thousand, four hundred forty-two".