639012849847 has 8 divisors (see below), whose sum is σ = 659697567872. Its totient is φ = 618332594400.

The previous prime is 639012849823. The next prime is 639012849869. The reversal of 639012849847 is 748948210936.

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

It is a cyclic number.

It is not a de Polignac number, because 639012849847 - 2²³ = 639004461239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639012849247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823404 + ... + 1398577.

It is an arithmetic number, because the mean of its divisors is an integer number (82462195984).

Almost surely, 2^639012849847 is an apocalyptic number.

639012849847 is a deficient number, since it is larger than the sum of its proper divisors (20684718025).

639012849847 is a wasteful number, since it uses less digits than its factorization.

639012849847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231289.

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 639012849847 in words is "six hundred thirty-nine billion, twelve million, eight hundred forty-nine thousand, eight hundred forty-seven".