27491057918691 has 4 divisors (see below), whose sum is σ = 36654743891592. Its totient is φ = 18327371945792.

The previous prime is 27491057918677. The next prime is 27491057918741. The reversal of 27491057918691 is 19681975019472.

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 27491057918691 - 2⁶ = 27491057918627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27491057958691) 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, 4581842986446 + ... + 4581842986451.

It is an arithmetic number, because the mean of its divisors is an integer number (9163685972898).

Almost surely, 2^{27491057918691} is an apocalyptic number.

27491057918691 is a deficient number, since it is larger than the sum of its proper divisors (9163685972901).

27491057918691 is an equidigital number, since it uses as much as digits as its factorization.

27491057918691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9163685972900.

The product of its (nonzero) digits is 68584320, while the sum is 69.

The spelling of 27491057918691 in words is "twenty-seven trillion, four hundred ninety-one billion, fifty-seven million, nine hundred eighteen thousand, six hundred ninety-one".