26540005631999 has 4 divisors (see below), whose sum is σ = 26541219799320. Its totient is φ = 26538791464680.

The previous prime is 26540005631989. The next prime is 26540005632013. The reversal of 26540005631999 is 99913650004562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26540005631999 - 2⁸ = 26540005631743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26540005631989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607050872 + ... + 607094589.

It is an arithmetic number, because the mean of its divisors is an integer number (6635304949830).

Almost surely, 2^{26540005631999} is an apocalyptic number.

26540005631999 is a deficient number, since it is larger than the sum of its proper divisors (1214167321).

26540005631999 is a wasteful number, since it uses less digits than its factorization.

26540005631999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214167320.

The product of its (nonzero) digits is 15746400, while the sum is 59.

The spelling of 26540005631999 in words is "twenty-six trillion, five hundred forty billion, five million, six hundred thirty-one thousand, nine hundred ninety-nine".