91664265214891 has 2 divisors, whose sum is σ = 91664265214892. Its totient is φ = 91664265214890.

The previous prime is 91664265214883. The next prime is 91664265214927. The reversal of 91664265214891 is 19841256246619.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91664265214891 - 2³ = 91664265214883 is a prime.

It is a super-3 number, since 3×91664265214891³ (a number of 43 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (91664265211891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45832132607445 + 45832132607446.

It is an arithmetic number, because the mean of its divisors is an integer number (45832132607446).

Almost surely, 2^{91664265214891} is an apocalyptic number.

91664265214891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91664265214891 is an equidigital number, since it uses as much as digits as its factorization.

91664265214891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44789760, while the sum is 64.

The spelling of 91664265214891 in words is "ninety-one trillion, six hundred sixty-four billion, two hundred sixty-five million, two hundred fourteen thousand, eight hundred ninety-one".