639192789005 has 4 divisors (see below), whose sum is σ = 767031346812. Its totient is φ = 511354231200.

The previous prime is 639192788987. The next prime is 639192789023. The reversal of 639192789005 is 500987291936.

639192789005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (639192788987) and next prime (639192789023).

It can be written as a sum of positive squares in 2 ways, for example, as 315419270884 + 323773518121 = 561622^2 + 569011^2 .

It is a de Polignac number, because none of the positive numbers 2^k-639192789005 is a prime.

It is a Duffinian number.

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, 63919278896 + ... + 63919278905.

It is an arithmetic number, because the mean of its divisors is an integer number (191757836703).

Almost surely, 2^639192789005 is an apocalyptic number.

It is an amenable number.

639192789005 is a deficient number, since it is larger than the sum of its proper divisors (127838557807).

639192789005 is a wasteful number, since it uses less digits than its factorization.

639192789005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127838557806.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 639192789005 in words is "six hundred thirty-nine billion, one hundred ninety-two million, seven hundred eighty-nine thousand, five".