25515960389 has 2 divisors, whose sum is σ = 25515960390. Its totient is φ = 25515960388.

The previous prime is 25515960359. The next prime is 25515960403. The reversal of 25515960389 is 98306951552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19246012900 + 6269947489 = 138730^2 + 79183^2 .

It is a cyclic number.

It is not a de Polignac number, because 25515960389 - 2¹⁶ = 25515894853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25515960389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25515960359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12757980194 + 12757980195.

It is an arithmetic number, because the mean of its divisors is an integer number (12757980195).

Almost surely, 2^25515960389 is an apocalyptic number.

It is an amenable number.

25515960389 is a deficient number, since it is larger than the sum of its proper divisors (1).

25515960389 is an equidigital number, since it uses as much as digits as its factorization.

25515960389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 25515960389 in words is "twenty-five billion, five hundred fifteen million, nine hundred sixty thousand, three hundred eighty-nine".