25087951081 has 2 divisors, whose sum is σ = 25087951082. Its totient is φ = 25087951080.

The previous prime is 25087951073. The next prime is 25087951103. The reversal of 25087951081 is 18015978052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23939825625 + 1148125456 = 154725^2 + 33884^2 .

It is a cyclic number.

It is not a de Polignac number, because 25087951081 - 2³ = 25087951073 is a prime.

It is a super-2 number, since 2×25087951081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25087951001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12543975540 + 12543975541.

It is an arithmetic number, because the mean of its divisors is an integer number (12543975541).

Almost surely, 2^25087951081 is an apocalyptic number.

It is an amenable number.

25087951081 is a deficient number, since it is larger than the sum of its proper divisors (1).

25087951081 is an equidigital number, since it uses as much as digits as its factorization.

25087951081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 25087951081 in words is "twenty-five billion, eighty-seven million, nine hundred fifty-one thousand, eighty-one".