91166956397896 has 32 divisors (see below), whose sum is σ = 178370720265600. Its totient is φ = 43601444064640.

The previous prime is 91166956397887. The next prime is 91166956397903. The reversal of 91166956397896 is 69879365966119.

It is a happy number.

It is a super-2 number, since 2×91166956397896² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73412781 + ... + 74644291.

It is an arithmetic number, because the mean of its divisors is an integer number (5574085008300).

Almost surely, 2^{91166956397896} is an apocalyptic number.

It is an amenable number.

91166956397896 is a deficient number, since it is larger than the sum of its proper divisors (87203763867704).

91166956397896 is a wasteful number, since it uses less digits than its factorization.

91166956397896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633869 (or 1633865 counting only the distinct ones).

The product of its digits is 7142567040, while the sum is 85.

The spelling of 91166956397896 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-six million, three hundred ninety-seven thousand, eight hundred ninety-six".