91166956398019 has 2 divisors, whose sum is σ = 91166956398020. Its totient is φ = 91166956398018.

The previous prime is 91166956397981. The next prime is 91166956398041. The reversal of 91166956398019 is 91089365966119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91166956398019 - 2¹⁹ = 91166955873731 is a prime.

It is a super-2 number, since 2×91166956398019² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91166956398319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45583478199009 + 45583478199010.

It is an arithmetic number, because the mean of its divisors is an integer number (45583478199010).

Almost surely, 2^{91166956398019} is an apocalyptic number.

91166956398019 is a deficient number, since it is larger than the sum of its proper divisors (1).

91166956398019 is an equidigital number, since it uses as much as digits as its factorization.

91166956398019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 170061120, while the sum is 73.

The spelling of 91166956398019 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-six million, three hundred ninety-eight thousand, nineteen".