25040916161 has 2 divisors, whose sum is σ = 25040916162. Its totient is φ = 25040916160.

The previous prime is 25040916157. The next prime is 25040916169. The reversal of 25040916161 is 16161904052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23031097600 + 2009818561 = 151760^2 + 44831^2 .

It is a cyclic number.

It is not a de Polignac number, because 25040916161 - 2² = 25040916157 is a prime.

It is not a weakly prime, because it can be changed into another prime (25040916169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12520458080 + 12520458081.

It is an arithmetic number, because the mean of its divisors is an integer number (12520458081).

Almost surely, 2^25040916161 is an apocalyptic number.

It is an amenable number.

25040916161 is a deficient number, since it is larger than the sum of its proper divisors (1).

25040916161 is an equidigital number, since it uses as much as digits as its factorization.

25040916161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 25040916161 in words is "twenty-five billion, forty million, nine hundred sixteen thousand, one hundred sixty-one".