26661143838697 has 2 divisors, whose sum is σ = 26661143838698. Its totient is φ = 26661143838696.

The previous prime is 26661143838683. The next prime is 26661143838781. The reversal of 26661143838697 is 79683834116662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20291925678336 + 6369218160361 = 4504656^2 + 2523731^2 .

It is a cyclic number.

It is not a de Polignac number, because 26661143838697 - 2⁷ = 26661143838569 is a prime.

It is not a weakly prime, because it can be changed into another prime (26661143838617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13330571919348 + 13330571919349.

It is an arithmetic number, because the mean of its divisors is an integer number (13330571919349).

Almost surely, 2^{26661143838697} is an apocalyptic number.

It is an amenable number.

26661143838697 is a deficient number, since it is larger than the sum of its proper divisors (1).

26661143838697 is an equidigital number, since it uses as much as digits as its factorization.

26661143838697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376233984, while the sum is 70.

The spelling of 26661143838697 in words is "twenty-six trillion, six hundred sixty-one billion, one hundred forty-three million, eight hundred thirty-eight thousand, six hundred ninety-seven".