26611620055991 has 4 divisors (see below), whose sum is σ = 26618636041872. Its totient is φ = 26604604070112.

The previous prime is 26611620055987. The next prime is 26611620055997. The reversal of 26611620055991 is 19955002611662.

It is a happy number.

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 26611620055991 - 2² = 26611620055987 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 (26611620055997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3507987251 + ... + 3507994836.

It is an arithmetic number, because the mean of its divisors is an integer number (6654659010468).

Almost surely, 2^{26611620055991} is an apocalyptic number.

26611620055991 is a deficient number, since it is larger than the sum of its proper divisors (7015985881).

26611620055991 is an equidigital number, since it uses as much as digits as its factorization.

26611620055991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015985880.

The product of its (nonzero) digits is 1749600, while the sum is 53.

The spelling of 26611620055991 in words is "twenty-six trillion, six hundred eleven billion, six hundred twenty million, fifty-five thousand, nine hundred ninety-one".