25187903969 has 2 divisors, whose sum is σ = 25187903970. Its totient is φ = 25187903968.

The previous prime is 25187903959. The next prime is 25187904011. The reversal of 25187903969 is 96930978152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23550892369 + 1637011600 = 153463^2 + 40460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25187903969 is a prime.

It is a super-2 number, since 2×25187903969² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25187903959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12593951984 + 12593951985.

It is an arithmetic number, because the mean of its divisors is an integer number (12593951985).

Almost surely, 2^25187903969 is an apocalyptic number.

It is an amenable number.

25187903969 is a deficient number, since it is larger than the sum of its proper divisors (1).

25187903969 is an equidigital number, since it uses as much as digits as its factorization.

25187903969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 25187903969 in words is "twenty-five billion, one hundred eighty-seven million, nine hundred three thousand, nine hundred sixty-nine".