639455500005 has 96 divisors (see below), whose sum is σ = 1203132579840. Its totient is φ = 289156129920.

The previous prime is 639455499983. The next prime is 639455500031. The reversal of 639455500005 is 500005554936.

It is not a de Polignac number, because 639455500005 - 2¹¹ = 639455497957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639455500005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25116192 + ... + 25141638.

It is an arithmetic number, because the mean of its divisors is an integer number (12532631040).

Almost surely, 2^639455500005 is an apocalyptic number.

It is an amenable number.

639455500005 is a deficient number, since it is larger than the sum of its proper divisors (563677079835).

639455500005 is a wasteful number, since it uses less digits than its factorization.

639455500005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25839 (or 25832 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 42.

The spelling of 639455500005 in words is "six hundred thirty-nine billion, four hundred fifty-five million, five hundred thousand, five".