26540274991 has 2 divisors, whose sum is σ = 26540274992. Its totient is φ = 26540274990.

The previous prime is 26540274983. The next prime is 26540275007. The reversal of 26540274991 is 19947204562.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26540274991 - 2³ = 26540274983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26540274941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13270137495 + 13270137496.

It is an arithmetic number, because the mean of its divisors is an integer number (13270137496).

Almost surely, 2^26540274991 is an apocalyptic number.

26540274991 is a deficient number, since it is larger than the sum of its proper divisors (1).

26540274991 is an equidigital number, since it uses as much as digits as its factorization.

26540274991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 26540274991 in words is "twenty-six billion, five hundred forty million, two hundred seventy-four thousand, nine hundred ninety-one".