639430303667 has 4 divisors (see below), whose sum is σ = 642778106496. Its totient is φ = 636082500840.

The previous prime is 639430303651. The next prime is 639430303669. The reversal of 639430303667 is 766303034936.

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 639430303667 - 2⁴ = 639430303651 is a prime.

It is a super-3 number, since 3×639430303667³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639430303669) 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, 1673901128 + ... + 1673901509.

It is an arithmetic number, because the mean of its divisors is an integer number (160694526624).

Almost surely, 2^639430303667 is an apocalyptic number.

639430303667 is a deficient number, since it is larger than the sum of its proper divisors (3347802829).

639430303667 is a wasteful number, since it uses less digits than its factorization.

639430303667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347802828.

The product of its (nonzero) digits is 4408992, while the sum is 50.

The spelling of 639430303667 in words is "six hundred thirty-nine billion, four hundred thirty million, three hundred three thousand, six hundred sixty-seven".