25113249661 has 2 divisors, whose sum is σ = 25113249662. Its totient is φ = 25113249660.

The previous prime is 25113249653. The next prime is 25113249691. The reversal of 25113249661 is 16694231152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23930233636 + 1183016025 = 154694^2 + 34395^2 .

It is a cyclic number.

It is not a de Polignac number, because 25113249661 - 2³ = 25113249653 is a prime.

It is a super-2 number, since 2×25113249661² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25113249691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12556624830 + 12556624831.

It is an arithmetic number, because the mean of its divisors is an integer number (12556624831).

Almost surely, 2^25113249661 is an apocalyptic number.

It is an amenable number.

25113249661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25113249661 is an equidigital number, since it uses as much as digits as its factorization.

25113249661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The spelling of 25113249661 in words is "twenty-five billion, one hundred thirteen million, two hundred forty-nine thousand, six hundred sixty-one".