25165268017 has 2 divisors, whose sum is σ = 25165268018. Its totient is φ = 25165268016.

The previous prime is 25165267973. The next prime is 25165268039. The reversal of 25165268017 is 71086256152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23369542641 + 1795725376 = 152871^2 + 42376^2 .

It is a cyclic number.

It is not a de Polignac number, because 25165268017 - 2¹⁹ = 25164743729 is a prime.

It is a super-2 number, since 2×25165268017² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25165268057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12582634008 + 12582634009.

It is an arithmetic number, because the mean of its divisors is an integer number (12582634009).

Almost surely, 2^25165268017 is an apocalyptic number.

It is an amenable number.

25165268017 is a deficient number, since it is larger than the sum of its proper divisors (1).

25165268017 is an equidigital number, since it uses as much as digits as its factorization.

25165268017 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 43.

The spelling of 25165268017 in words is "twenty-five billion, one hundred sixty-five million, two hundred sixty-eight thousand, seventeen".