30771956639 has 4 divisors (see below), whose sum is σ = 30795683424. Its totient is φ = 30748229856.

The previous prime is 30771956623. The next prime is 30771956707. The reversal of 30771956639 is 93665917703.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93665917703 = 134597 ⋅695899.

It is a cyclic number.

It is not a de Polignac number, because 30771956639 - 2⁴ = 30771956623 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 (30771956609) 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, 11861447 + ... + 11864040.

It is an arithmetic number, because the mean of its divisors is an integer number (7698920856).

Almost surely, 2^30771956639 is an apocalyptic number.

30771956639 is a deficient number, since it is larger than the sum of its proper divisors (23726785).

30771956639 is a wasteful number, since it uses less digits than its factorization.

30771956639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23726784.

The product of its (nonzero) digits is 6429780, while the sum is 56.

The spelling of 30771956639 in words is "thirty billion, seven hundred seventy-one million, nine hundred fifty-six thousand, six hundred thirty-nine".