30856172639 has 4 divisors (see below), whose sum is σ = 30870988056. Its totient is φ = 30841357224.

The previous prime is 30856172621. The next prime is 30856172671. The reversal of 30856172639 is 93627165803.

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 30856172639 - 2⁸ = 30856172383 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 (30856171639) 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, 7404584 + ... + 7408749.

It is an arithmetic number, because the mean of its divisors is an integer number (7717747014).

Almost surely, 2^30856172639 is an apocalyptic number.

30856172639 is a deficient number, since it is larger than the sum of its proper divisors (14815417).

30856172639 is a wasteful number, since it uses less digits than its factorization.

30856172639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14815416.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 30856172639 in words is "thirty billion, eight hundred fifty-six million, one hundred seventy-two thousand, six hundred thirty-nine".