25561927031 has 2 divisors, whose sum is σ = 25561927032. Its totient is φ = 25561927030.

The previous prime is 25561926889. The next prime is 25561927049. The reversal of 25561927031 is 13072916552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25561927031 - 2²² = 25557732727 is a prime.

It is a super-2 number, since 2×25561927031² (a number of 22 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 25561927031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25561927051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780963515 + 12780963516.

It is an arithmetic number, because the mean of its divisors is an integer number (12780963516).

Almost surely, 2^25561927031 is an apocalyptic number.

25561927031 is a deficient number, since it is larger than the sum of its proper divisors (1).

25561927031 is an equidigital number, since it uses as much as digits as its factorization.

25561927031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 25561927031 in words is "twenty-five billion, five hundred sixty-one million, nine hundred twenty-seven thousand, thirty-one".