25603551564431 has 2 divisors, whose sum is σ = 25603551564432. Its totient is φ = 25603551564430.

The previous prime is 25603551564427. The next prime is 25603551564457. The reversal of 25603551564431 is 13446515530652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25603551564431 - 2² = 25603551564427 is a prime.

It is a super-2 number, since 2×25603551564431² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25603551564431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25603551564491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12801775782215 + 12801775782216.

It is an arithmetic number, because the mean of its divisors is an integer number (12801775782216).

Almost surely, 2^{25603551564431} is an apocalyptic number.

25603551564431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25603551564431 is an equidigital number, since it uses as much as digits as its factorization.

25603551564431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480000, while the sum is 50.

The spelling of 25603551564431 in words is "twenty-five trillion, six hundred three billion, five hundred fifty-one million, five hundred sixty-four thousand, four hundred thirty-one".