12565157441 has 2 divisors, whose sum is σ = 12565157442. Its totient is φ = 12565157440.

The previous prime is 12565157431. The next prime is 12565157459. The reversal of 12565157441 is 14475156521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11706374416 + 858783025 = 108196^2 + 29305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12565157441 is a prime.

It is not a weakly prime, because it can be changed into another prime (12565157401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282578720 + 6282578721.

It is an arithmetic number, because the mean of its divisors is an integer number (6282578721).

Almost surely, 2^12565157441 is an apocalyptic number.

It is an amenable number.

12565157441 is a deficient number, since it is larger than the sum of its proper divisors (1).

12565157441 is an equidigital number, since it uses as much as digits as its factorization.

12565157441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 41.

The spelling of 12565157441 in words is "twelve billion, five hundred sixty-five million, one hundred fifty-seven thousand, four hundred forty-one".