639085032209 has 4 divisors (see below), whose sum is σ = 688245419316. Its totient is φ = 589924645104.

The previous prime is 639085032199. The next prime is 639085032263. The reversal of 639085032209 is 902230580936.

It is a happy number.

639085032209 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 can be written as a sum of positive squares in 2 ways, for example, as 365317492225 + 273767539984 = 604415^2 + 523228^2 .

It is a cyclic number.

It is not a de Polignac number, because 639085032209 - 2²⁸ = 638816596753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639085032269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24580193534 + ... + 24580193559.

It is an arithmetic number, because the mean of its divisors is an integer number (172061354829).

Almost surely, 2^639085032209 is an apocalyptic number.

It is an amenable number.

639085032209 is a deficient number, since it is larger than the sum of its proper divisors (49160387107).

639085032209 is a wasteful number, since it uses less digits than its factorization.

639085032209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49160387106.

The product of its (nonzero) digits is 699840, while the sum is 47.

The spelling of 639085032209 in words is "six hundred thirty-nine billion, eighty-five million, thirty-two thousand, two hundred nine".