639562009567 has 4 divisors (see below), whose sum is σ = 688759087240. Its totient is φ = 590364931896.

The previous prime is 639562009549. The next prime is 639562009613. The reversal of 639562009567 is 765900265936.

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

It is a cyclic number.

It is not a de Polignac number, because 639562009567 - 2²⁷ = 639427791839 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 (639562004567) 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, 24598538817 + ... + 24598538842.

It is an arithmetic number, because the mean of its divisors is an integer number (172189771810).

Almost surely, 2^639562009567 is an apocalyptic number.

639562009567 is a deficient number, since it is larger than the sum of its proper divisors (49197077673).

639562009567 is a wasteful number, since it uses less digits than its factorization.

639562009567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49197077672.

The product of its (nonzero) digits is 18370800, while the sum is 58.

The spelling of 639562009567 in words is "six hundred thirty-nine billion, five hundred sixty-two million, nine thousand, five hundred sixty-seven".