25373104661 has 2 divisors, whose sum is σ = 25373104662. Its totient is φ = 25373104660.

The previous prime is 25373104609. The next prime is 25373104681. The reversal of 25373104661 is 16640137352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18699195025 + 6673909636 = 136745^2 + 81694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25373104661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25373104681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12686552330 + 12686552331.

It is an arithmetic number, because the mean of its divisors is an integer number (12686552331).

Almost surely, 2^25373104661 is an apocalyptic number.

It is an amenable number.

25373104661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25373104661 is an equidigital number, since it uses as much as digits as its factorization.

25373104661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 25373104661 in words is "twenty-five billion, three hundred seventy-three million, one hundred four thousand, six hundred sixty-one".