891936691799 has 2 divisors, whose sum is σ = 891936691800. Its totient is φ = 891936691798.

The previous prime is 891936691783. The next prime is 891936691801. The reversal of 891936691799 is 997196639198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891936691799 - 2⁴ = 891936691783 is a prime.

Together with 891936691801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891936691769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445968345899 + 445968345900.

It is an arithmetic number, because the mean of its divisors is an integer number (445968345900).

Almost surely, 2^891936691799 is an apocalyptic number.

891936691799 is a deficient number, since it is larger than the sum of its proper divisors (1).

891936691799 is an equidigital number, since it uses as much as digits as its factorization.

891936691799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 357128352, while the sum is 77.

The spelling of 891936691799 in words is "eight hundred ninety-one billion, nine hundred thirty-six million, six hundred ninety-one thousand, seven hundred ninety-nine".