26665361658911 has 2 divisors, whose sum is σ = 26665361658912. Its totient is φ = 26665361658910.

The previous prime is 26665361658877. The next prime is 26665361658919. The reversal of 26665361658911 is 11985616356662.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26665361658911 - 2³⁰ = 26664287917087 is a prime.

It is a super-2 number, since 2×26665361658911² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26665361658919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13332680829455 + 13332680829456.

It is an arithmetic number, because the mean of its divisors is an integer number (13332680829456).

Almost surely, 2^{26665361658911} is an apocalyptic number.

26665361658911 is a deficient number, since it is larger than the sum of its proper divisors (1).

26665361658911 is an equidigital number, since it uses as much as digits as its factorization.

26665361658911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83980800, while the sum is 65.

The spelling of 26665361658911 in words is "twenty-six trillion, six hundred sixty-five billion, three hundred sixty-one million, six hundred fifty-eight thousand, nine hundred eleven".