30945662521 has 2 divisors, whose sum is σ = 30945662522. Its totient is φ = 30945662520.

The previous prime is 30945662507. The next prime is 30945662533. The reversal of 30945662521 is 12526654903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23726781225 + 7218881296 = 154035^2 + 84964^2 .

It is a cyclic number.

It is not a de Polignac number, because 30945662521 - 2²¹ = 30943565369 is a prime.

It is not a weakly prime, because it can be changed into another prime (30945662551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15472831260 + 15472831261.

It is an arithmetic number, because the mean of its divisors is an integer number (15472831261).

Almost surely, 2^30945662521 is an apocalyptic number.

It is an amenable number.

30945662521 is a deficient number, since it is larger than the sum of its proper divisors (1).

30945662521 is an equidigital number, since it uses as much as digits as its factorization.

30945662521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 30945662521 in words is "thirty billion, nine hundred forty-five million, six hundred sixty-two thousand, five hundred twenty-one".