25623128731 has 2 divisors, whose sum is σ = 25623128732. Its totient is φ = 25623128730.

The previous prime is 25623128723. The next prime is 25623128749. The reversal of 25623128731 is 13782132652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25623128731 - 2³ = 25623128723 is a prime.

It is a super-2 number, since 2×25623128731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25623128711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12811564365 + 12811564366.

It is an arithmetic number, because the mean of its divisors is an integer number (12811564366).

Almost surely, 2^25623128731 is an apocalyptic number.

25623128731 is a deficient number, since it is larger than the sum of its proper divisors (1).

25623128731 is an equidigital number, since it uses as much as digits as its factorization.

25623128731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The spelling of 25623128731 in words is "twenty-five billion, six hundred twenty-three million, one hundred twenty-eight thousand, seven hundred thirty-one".