30990836257 has 2 divisors, whose sum is σ = 30990836258. Its totient is φ = 30990836256.

The previous prime is 30990836237. The next prime is 30990836297. The reversal of 30990836257 is 75263809903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28274758801 + 2716077456 = 168151^2 + 52116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30990836257 is a prime.

It is not a weakly prime, because it can be changed into another prime (30990836207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15495418128 + 15495418129.

It is an arithmetic number, because the mean of its divisors is an integer number (15495418129).

Almost surely, 2^30990836257 is an apocalyptic number.

It is an amenable number.

30990836257 is a deficient number, since it is larger than the sum of its proper divisors (1).

30990836257 is an equidigital number, since it uses as much as digits as its factorization.

30990836257 is an evil number, because the sum of its binary digits is even.

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

The spelling of 30990836257 in words is "thirty billion, nine hundred ninety million, eight hundred thirty-six thousand, two hundred fifty-seven".