25175864881 has 2 divisors, whose sum is σ = 25175864882. Its totient is φ = 25175864880.

The previous prime is 25175864851. The next prime is 25175864921. The reversal of 25175864881 is 18846857152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23685210000 + 1490654881 = 153900^2 + 38609^2 .

It is a cyclic number.

It is not a de Polignac number, because 25175864881 - 2¹⁵ = 25175832113 is a prime.

It is a super-2 number, since 2×25175864881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25175864851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12587932440 + 12587932441.

It is an arithmetic number, because the mean of its divisors is an integer number (12587932441).

Almost surely, 2^25175864881 is an apocalyptic number.

It is an amenable number.

25175864881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25175864881 is an equidigital number, since it uses as much as digits as its factorization.

25175864881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4300800, while the sum is 55.

The spelling of 25175864881 in words is "twenty-five billion, one hundred seventy-five million, eight hundred sixty-four thousand, eight hundred eighty-one".