25966409597 has 2 divisors, whose sum is σ = 25966409598. Its totient is φ = 25966409596.

The previous prime is 25966409519. The next prime is 25966409657. The reversal of 25966409597 is 79590466952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23717848036 + 2248561561 = 154006^2 + 47419^2 .

It is a cyclic number.

It is not a de Polignac number, because 25966409597 - 2²⁶ = 25899300733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25966409897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12983204798 + 12983204799.

It is an arithmetic number, because the mean of its divisors is an integer number (12983204799).

Almost surely, 2^25966409597 is an apocalyptic number.

It is an amenable number.

25966409597 is a deficient number, since it is larger than the sum of its proper divisors (1).

25966409597 is an equidigital number, since it uses as much as digits as its factorization.

25966409597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36741600, while the sum is 62.

The spelling of 25966409597 in words is "twenty-five billion, nine hundred sixty-six million, four hundred nine thousand, five hundred ninety-seven".