25391145569 has 2 divisors, whose sum is σ = 25391145570. Its totient is φ = 25391145568.

The previous prime is 25391145557. The next prime is 25391145589. The reversal of 25391145569 is 96554119352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21334984225 + 4056161344 = 146065^2 + 63688^2 .

It is a cyclic number.

It is not a de Polignac number, because 25391145569 - 2³² = 21096178273 is a prime.

It is a super-2 number, since 2×25391145569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25391145509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695572784 + 12695572785.

It is an arithmetic number, because the mean of its divisors is an integer number (12695572785).

Almost surely, 2^25391145569 is an apocalyptic number.

It is an amenable number.

25391145569 is a deficient number, since it is larger than the sum of its proper divisors (1).

25391145569 is an equidigital number, since it uses as much as digits as its factorization.

25391145569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458000, while the sum is 50.

The spelling of 25391145569 in words is "twenty-five billion, three hundred ninety-one million, one hundred forty-five thousand, five hundred sixty-nine".