26925317581 has 2 divisors, whose sum is σ = 26925317582. Its totient is φ = 26925317580.

The previous prime is 26925317569. The next prime is 26925317659. The reversal of 26925317581 is 18571352962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23636295081 + 3289022500 = 153741^2 + 57350^2 .

It is a cyclic number.

It is not a de Polignac number, because 26925317581 - 2²⁵ = 26891763149 is a prime.

It is a super-2 number, since 2×26925317581² (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 (26925317381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13462658790 + 13462658791.

It is an arithmetic number, because the mean of its divisors is an integer number (13462658791).

Almost surely, 2^26925317581 is an apocalyptic number.

It is an amenable number.

26925317581 is a deficient number, since it is larger than the sum of its proper divisors (1).

26925317581 is an equidigital number, since it uses as much as digits as its factorization.

26925317581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The spelling of 26925317581 in words is "twenty-six billion, nine hundred twenty-five million, three hundred seventeen thousand, five hundred eighty-one".