26240816491 has 2 divisors, whose sum is σ = 26240816492. Its totient is φ = 26240816490.

The previous prime is 26240816477. The next prime is 26240816501. The reversal of 26240816491 is 19461804262.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26240816491 - 2²³ = 26232427883 is a prime.

It is a super-2 number, since 2×26240816491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26240816411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13120408245 + 13120408246.

It is an arithmetic number, because the mean of its divisors is an integer number (13120408246).

Almost surely, 2^26240816491 is an apocalyptic number.

26240816491 is a deficient number, since it is larger than the sum of its proper divisors (1).

26240816491 is an equidigital number, since it uses as much as digits as its factorization.

26240816491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 26240816491 in words is "twenty-six billion, two hundred forty million, eight hundred sixteen thousand, four hundred ninety-one".