30920785639 has 2 divisors, whose sum is σ = 30920785640. Its totient is φ = 30920785638.

The previous prime is 30920785627. The next prime is 30920785657. The reversal of 30920785639 is 93658702903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30920785639 - 2²⁹ = 30383914727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30920785139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15460392819 + 15460392820.

It is an arithmetic number, because the mean of its divisors is an integer number (15460392820).

Almost surely, 2^30920785639 is an apocalyptic number.

30920785639 is a deficient number, since it is larger than the sum of its proper divisors (1).

30920785639 is an equidigital number, since it uses as much as digits as its factorization.

30920785639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 30920785639 in words is "thirty billion, nine hundred twenty million, seven hundred eighty-five thousand, six hundred thirty-nine".