25105295081 has 2 divisors, whose sum is σ = 25105295082. Its totient is φ = 25105295080.

The previous prime is 25105295021. The next prime is 25105295119. The reversal of 25105295081 is 18059250152.

It is a happy number.

It is an a-pointer prime, because the next prime (25105295119) can be obtained adding 25105295081 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24937463056 + 167832025 = 157916^2 + 12955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25105295081 is a prime.

It is a super-2 number, since 2×25105295081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25105295021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12552647540 + 12552647541.

It is an arithmetic number, because the mean of its divisors is an integer number (12552647541).

Almost surely, 2^25105295081 is an apocalyptic number.

It is an amenable number.

25105295081 is a deficient number, since it is larger than the sum of its proper divisors (1).

25105295081 is an equidigital number, since it uses as much as digits as its factorization.

25105295081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 38.

The spelling of 25105295081 in words is "twenty-five billion, one hundred five million, two hundred ninety-five thousand, eighty-one".