30820825957 has 2 divisors, whose sum is σ = 30820825958. Its totient is φ = 30820825956.

The previous prime is 30820825949. The next prime is 30820825991. The reversal of 30820825957 is 75952802803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28790963041 + 2029862916 = 169679^2 + 45054^2 .

It is a cyclic number.

It is not a de Polignac number, because 30820825957 - 2³ = 30820825949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30820825957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30820822957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15410412978 + 15410412979.

It is an arithmetic number, because the mean of its divisors is an integer number (15410412979).

Almost surely, 2^30820825957 is an apocalyptic number.

It is an amenable number.

30820825957 is a deficient number, since it is larger than the sum of its proper divisors (1).

30820825957 is an equidigital number, since it uses as much as digits as its factorization.

30820825957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 30820825957 in words is "thirty billion, eight hundred twenty million, eight hundred twenty-five thousand, nine hundred fifty-seven".