30561345506491 has 2 divisors, whose sum is σ = 30561345506492. Its totient is φ = 30561345506490.

The previous prime is 30561345506479. The next prime is 30561345506561. The reversal of 30561345506491 is 19460554316503.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30561345506491 - 2³⁹ = 30011589692603 is a prime.

It is not a weakly prime, because it can be changed into another prime (30561345506431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15280672753245 + 15280672753246.

It is an arithmetic number, because the mean of its divisors is an integer number (15280672753246).

Almost surely, 2^{30561345506491} is an apocalyptic number.

30561345506491 is a deficient number, since it is larger than the sum of its proper divisors (1).

30561345506491 is an equidigital number, since it uses as much as digits as its factorization.

30561345506491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 30561345506491 in words is "thirty trillion, five hundred sixty-one billion, three hundred forty-five million, five hundred six thousand, four hundred ninety-one".