91166956397984 has 24 divisors (see below), whose sum is σ = 179584604014788. Its totient is φ = 45558168076800.

The previous prime is 91166956397981. The next prime is 91166956398019. The reversal of 91166956397984 is 48979365966119.

It can be written as a sum of positive squares in 2 ways, for example, as 69428423146384 + 21738533251600 = 8332372^2 + 4662460^2 .

It is a super-2 number, since 2×91166956397984² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91166956397981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790882787 + ... + 790998050.

Almost surely, 2^{91166956397984} is an apocalyptic number.

It is an amenable number.

91166956397984 is a deficient number, since it is larger than the sum of its proper divisors (88417647616804).

91166956397984 is a wasteful number, since it uses less digits than its factorization.

91166956397984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581882648 (or 1581882640 counting only the distinct ones).

The product of its digits is 4761711360, while the sum is 83.

The spelling of 91166956397984 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-six million, three hundred ninety-seven thousand, nine hundred eighty-four".