25039964161 has 2 divisors, whose sum is σ = 25039964162. Its totient is φ = 25039964160.

The previous prime is 25039964143. The next prime is 25039964167. The reversal of 25039964161 is 16146993052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23980071025 + 1059893136 = 154855^2 + 32556^2 .

It is a cyclic number.

It is not a de Polignac number, because 25039964161 - 2²¹ = 25037867009 is a prime.

It is not a weakly prime, because it can be changed into another prime (25039964167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12519982080 + 12519982081.

It is an arithmetic number, because the mean of its divisors is an integer number (12519982081).

Almost surely, 2^25039964161 is an apocalyptic number.

It is an amenable number.

25039964161 is a deficient number, since it is larger than the sum of its proper divisors (1).

25039964161 is an equidigital number, since it uses as much as digits as its factorization.

25039964161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 25039964161 in words is "twenty-five billion, thirty-nine million, nine hundred sixty-four thousand, one hundred sixty-one".