25612321913 has 2 divisors, whose sum is σ = 25612321914. Its totient is φ = 25612321912.

The previous prime is 25612321829. The next prime is 25612321937. The reversal of 25612321913 is 31912321652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25409316409 + 203005504 = 159403^2 + 14248^2 .

It is a cyclic number.

It is not a de Polignac number, because 25612321913 - 2¹⁶ = 25612256377 is a prime.

It is not a weakly prime, because it can be changed into another prime (25612327913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12806160956 + 12806160957.

It is an arithmetic number, because the mean of its divisors is an integer number (12806160957).

Almost surely, 2^25612321913 is an apocalyptic number.

It is an amenable number.

25612321913 is a deficient number, since it is larger than the sum of its proper divisors (1).

25612321913 is an equidigital number, since it uses as much as digits as its factorization.

25612321913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The spelling of 25612321913 in words is "twenty-five billion, six hundred twelve million, three hundred twenty-one thousand, nine hundred thirteen".