25662631109 has 2 divisors, whose sum is σ = 25662631110. Its totient is φ = 25662631108.

The previous prime is 25662631081. The next prime is 25662631117. The reversal of 25662631109 is 90113626652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22915298884 + 2747332225 = 151378^2 + 52415^2 .

It is a cyclic number.

It is not a de Polignac number, because 25662631109 - 2¹² = 25662627013 is a prime.

It is a super-2 number, since 2×25662631109² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25662631609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12831315554 + 12831315555.

It is an arithmetic number, because the mean of its divisors is an integer number (12831315555).

Almost surely, 2^25662631109 is an apocalyptic number.

It is an amenable number.

25662631109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25662631109 is an equidigital number, since it uses as much as digits as its factorization.

25662631109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 25662631109 in words is "twenty-five billion, six hundred sixty-two million, six hundred thirty-one thousand, one hundred nine".