639905095007 has 8 divisors (see below), whose sum is σ = 649582107552. Its totient is φ = 630246534400.

The previous prime is 639905094979. The next prime is 639905095031. The reversal of 639905095007 is 700590509936.

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 639905095007 - 2²² = 639900900703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 639905095007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639905005007) 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, 4543094 + ... + 4681827.

It is an arithmetic number, because the mean of its divisors is an integer number (81197763444).

Almost surely, 2^639905095007 is an apocalyptic number.

639905095007 is a deficient number, since it is larger than the sum of its proper divisors (9677012545).

639905095007 is an equidigital number, since it uses as much as digits as its factorization.

639905095007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9225969.

The product of its (nonzero) digits is 2296350, while the sum is 53.

The spelling of 639905095007 in words is "six hundred thirty-nine billion, nine hundred five million, ninety-five thousand, seven".