25665197387 has 2 divisors, whose sum is σ = 25665197388. Its totient is φ = 25665197386.

The previous prime is 25665197377. The next prime is 25665197407. The reversal of 25665197387 is 78379156652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25665197387 - 2⁶ = 25665197323 is a prime.

It is not a weakly prime, because it can be changed into another prime (25665197377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832598693 + 12832598694.

It is an arithmetic number, because the mean of its divisors is an integer number (12832598694).

Almost surely, 2^25665197387 is an apocalyptic number.

25665197387 is a deficient number, since it is larger than the sum of its proper divisors (1).

25665197387 is an equidigital number, since it uses as much as digits as its factorization.

25665197387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19051200, while the sum is 59.

The spelling of 25665197387 in words is "twenty-five billion, six hundred sixty-five million, one hundred ninety-seven thousand, three hundred eighty-seven".