15885785854091 has 2 divisors, whose sum is σ = 15885785854092. Its totient is φ = 15885785854090.

The previous prime is 15885785854087. The next prime is 15885785854093. The reversal of 15885785854091 is 19045858758851.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15885785854091 - 2² = 15885785854087 is a prime.

Together with 15885785854093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15885785854093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7942892927045 + 7942892927046.

It is an arithmetic number, because the mean of its divisors is an integer number (7942892927046).

Almost surely, 2^{15885785854091} is an apocalyptic number.

15885785854091 is a deficient number, since it is larger than the sum of its proper divisors (1).

15885785854091 is an equidigital number, since it uses as much as digits as its factorization.

15885785854091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120000, while the sum is 74.

The spelling of 15885785854091 in words is "fifteen trillion, eight hundred eighty-five billion, seven hundred eighty-five million, eight hundred fifty-four thousand, ninety-one".