91166956397982 has 56 divisors (see below), whose sum is σ = 205699715957736. Its totient is φ = 30289998393936.

The previous prime is 91166956397981. The next prime is 91166956398019. The reversal of 91166956397982 is 28979365966119.

91166956397982 is a `hidden beast` number, since 9 + 1 + 1 + 66 + 95 + 6 + 397 + 9 + 82 = 666.

It is a super-2 number, since 2×91166956397982² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

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 27 ways as a sum of consecutive naturals, for example, 101390793 + ... + 102286004.

It is an arithmetic number, because the mean of its divisors is an integer number (3673209213531).

Almost surely, 2^{91166956397982} is an apocalyptic number.

91166956397982 is an abundant number, since it is smaller than the sum of its proper divisors (114532759559754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91166956397982 is a wasteful number, since it uses less digits than its factorization.

91166956397982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203677124 (or 203677109 counting only the distinct ones).

The product of its digits is 2380855680, while the sum is 81.

The spelling of 91166956397982 in words is "ninety-one trillion, one hundred sixty-six billion, nine hundred fifty-six million, three hundred ninety-seven thousand, nine hundred eighty-two".