25500011969 has 2 divisors, whose sum is σ = 25500011970. Its totient is φ = 25500011968.

The previous prime is 25500011921. The next prime is 25500012001. The reversal of 25500011969 is 96911000552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15839481025 + 9660530944 = 125855^2 + 98288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25500011969 is a prime.

It is a super-2 number, since 2×25500011969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25500011909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750005984 + 12750005985.

It is an arithmetic number, because the mean of its divisors is an integer number (12750005985).

Almost surely, 2^25500011969 is an apocalyptic number.

It is an amenable number.

25500011969 is a deficient number, since it is larger than the sum of its proper divisors (1).

25500011969 is an equidigital number, since it uses as much as digits as its factorization.

25500011969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 38.

The spelling of 25500011969 in words is "twenty-five billion, five hundred million, eleven thousand, nine hundred sixty-nine".