25531920597389 has 2 divisors, whose sum is σ = 25531920597390. Its totient is φ = 25531920597388.

The previous prime is 25531920597311. The next prime is 25531920597409. The reversal of 25531920597389 is 98379502913552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15209547603364 + 10322372994025 = 3899942^2 + 3212845^2 .

It is a cyclic number.

It is not a de Polignac number, because 25531920597389 - 2⁴⁴ = 7939734552973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25531920597089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765960298694 + 12765960298695.

It is an arithmetic number, because the mean of its divisors is an integer number (12765960298695).

Almost surely, 2^{25531920597389} is an apocalyptic number.

It is an amenable number.

25531920597389 is a deficient number, since it is larger than the sum of its proper divisors (1).

25531920597389 is an equidigital number, since it uses as much as digits as its factorization.

25531920597389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708000, while the sum is 68.

The spelling of 25531920597389 in words is "twenty-five trillion, five hundred thirty-one billion, nine hundred twenty million, five hundred ninety-seven thousand, three hundred eighty-nine".