639799127942 has 8 divisors (see below), whose sum is σ = 1033521668256. Its totient is φ = 295291905192.

The previous prime is 639799127911. The next prime is 639799127959. The reversal of 639799127942 is 249721997936.

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

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, 12303829358 + ... + 12303829409.

It is an arithmetic number, because the mean of its divisors is an integer number (129190208532).

Almost surely, 2^639799127942 is an apocalyptic number.

639799127942 is a deficient number, since it is larger than the sum of its proper divisors (393722540314).

639799127942 is a wasteful number, since it uses less digits than its factorization.

639799127942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24607658782.

The product of its digits is 92588832, while the sum is 68.

The spelling of 639799127942 in words is "six hundred thirty-nine billion, seven hundred ninety-nine million, one hundred twenty-seven thousand, nine hundred forty-two".