26297811569 has 2 divisors, whose sum is σ = 26297811570. Its totient is φ = 26297811568.

The previous prime is 26297811511. The next prime is 26297811607. The reversal of 26297811569 is 96511879262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25298493025 + 999318544 = 159055^2 + 31612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26297811569 is a prime.

It is a super-2 number, since 2×26297811569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26297811509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13148905784 + 13148905785.

It is an arithmetic number, because the mean of its divisors is an integer number (13148905785).

Almost surely, 2^26297811569 is an apocalyptic number.

It is an amenable number.

26297811569 is a deficient number, since it is larger than the sum of its proper divisors (1).

26297811569 is an equidigital number, since it uses as much as digits as its factorization.

26297811569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 56.

The spelling of 26297811569 in words is "twenty-six billion, two hundred ninety-seven million, eight hundred eleven thousand, five hundred sixty-nine".