91166955873731 has 2 divisors, whose sum is σ = 91166955873732. Its totient is φ = 91166955873730.

The previous prime is 91166955873713. The next prime is 91166955873761. The reversal of 91166955873731 is 13737855966119.

Together with previous prime (91166955873713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91166955873731 - 2⁶ = 91166955873667 is a prime.

It is a super-2 number, since 2×91166955873731² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91166955873701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45583477936865 + 45583477936866.

It is an arithmetic number, because the mean of its divisors is an integer number (45583477936866).

Almost surely, 2^{91166955873731} is an apocalyptic number.

91166955873731 is a deficient number, since it is larger than the sum of its proper divisors (1).

91166955873731 is an equidigital number, since it uses as much as digits as its factorization.

91166955873731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 257191200, while the sum is 71.

The spelling of 91166955873731 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-five million, eight hundred seventy-three thousand, seven hundred thirty-one".