639609099963 has 4 divisors (see below), whose sum is σ = 852812133288. Its totient is φ = 426406066640.

The previous prime is 639609099953. The next prime is 639609099971. The reversal of 639609099963 is 369990906936.

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 639609099963 - 2⁸ = 639609099707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639609099953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106601516658 + ... + 106601516663.

It is an arithmetic number, because the mean of its divisors is an integer number (213203033322).

Almost surely, 2^639609099963 is an apocalyptic number.

639609099963 is a deficient number, since it is larger than the sum of its proper divisors (213203033325).

639609099963 is a wasteful number, since it uses less digits than its factorization.

639609099963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213203033324.

The product of its (nonzero) digits is 114791256, while the sum is 69.

The spelling of 639609099963 in words is "six hundred thirty-nine billion, six hundred nine million, ninety-nine thousand, nine hundred sixty-three".