25012123181 has 2 divisors, whose sum is σ = 25012123182. Its totient is φ = 25012123180.

The previous prime is 25012123177. The next prime is 25012123189. The reversal of 25012123181 is 18132121052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22037402500 + 2974720681 = 148450^2 + 54541^2 .

It is a cyclic number.

It is not a de Polignac number, because 25012123181 - 2² = 25012123177 is a prime.

It is a super-2 number, since 2×25012123181² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25012123181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25012123189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12506061590 + 12506061591.

It is an arithmetic number, because the mean of its divisors is an integer number (12506061591).

Almost surely, 2^25012123181 is an apocalyptic number.

It is an amenable number.

25012123181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25012123181 is an equidigital number, since it uses as much as digits as its factorization.

25012123181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The spelling of 25012123181 in words is "twenty-five billion, twelve million, one hundred twenty-three thousand, one hundred eighty-one".