25157469217 has 2 divisors, whose sum is σ = 25157469218. Its totient is φ = 25157469216.

The previous prime is 25157469191. The next prime is 25157469247. The reversal of 25157469217 is 71296475152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14090639616 + 11066829601 = 118704^2 + 105199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25157469217 is a prime.

It is not a weakly prime, because it can be changed into another prime (25157469247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12578734608 + 12578734609.

It is an arithmetic number, because the mean of its divisors is an integer number (12578734609).

Almost surely, 2^25157469217 is an apocalyptic number.

It is an amenable number.

25157469217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25157469217 is an equidigital number, since it uses as much as digits as its factorization.

25157469217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 49.

The spelling of 25157469217 in words is "twenty-five billion, one hundred fifty-seven million, four hundred sixty-nine thousand, two hundred seventeen".