25163044661 has 2 divisors, whose sum is σ = 25163044662. Its totient is φ = 25163044660.

The previous prime is 25163044601. The next prime is 25163044681. The reversal of 25163044661 is 16644036152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17883712900 + 7279331761 = 133730^2 + 85319^2 .

It is a cyclic number.

It is not a de Polignac number, because 25163044661 - 2²⁶ = 25095935797 is a prime.

It is a super-2 number, since 2×25163044661² (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 (25163044601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12581522330 + 12581522331.

It is an arithmetic number, because the mean of its divisors is an integer number (12581522331).

Almost surely, 2^25163044661 is an apocalyptic number.

It is an amenable number.

25163044661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25163044661 is an equidigital number, since it uses as much as digits as its factorization.

25163044661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 25163044661 in words is "twenty-five billion, one hundred sixty-three million, forty-four thousand, six hundred sixty-one".