25165341557 has 2 divisors, whose sum is σ = 25165341558. Its totient is φ = 25165341556.

The previous prime is 25165341503. The next prime is 25165341577. The reversal of 25165341557 is 75514356152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21062426641 + 4102914916 = 145129^2 + 64054^2 .

It is a cyclic number.

It is not a de Polignac number, because 25165341557 - 2³⁰ = 24091599733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25165341577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12582670778 + 12582670779.

It is an arithmetic number, because the mean of its divisors is an integer number (12582670779).

Almost surely, 2^25165341557 is an apocalyptic number.

It is an amenable number.

25165341557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25165341557 is an equidigital number, since it uses as much as digits as its factorization.

25165341557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630000, while the sum is 44.

The spelling of 25165341557 in words is "twenty-five billion, one hundred sixty-five million, three hundred forty-one thousand, five hundred fifty-seven".