25251655181 has 2 divisors, whose sum is σ = 25251655182. Its totient is φ = 25251655180.

The previous prime is 25251655171. The next prime is 25251655369. The reversal of 25251655181 is 18155615252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15941335081 + 9310320100 = 126259^2 + 96490^2 .

It is a cyclic number.

It is not a de Polignac number, because 25251655181 - 2²² = 25247460877 is a prime.

It is a super-2 number, since 2×25251655181² (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 (25251655171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12625827590 + 12625827591.

It is an arithmetic number, because the mean of its divisors is an integer number (12625827591).

Almost surely, 2^25251655181 is an apocalyptic number.

It is an amenable number.

25251655181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25251655181 is an equidigital number, since it uses as much as digits as its factorization.

25251655181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120000, while the sum is 41.

The spelling of 25251655181 in words is "twenty-five billion, two hundred fifty-one million, six hundred fifty-five thousand, one hundred eighty-one".