91618180856 has 16 divisors (see below), whose sum is σ = 172032701640. Its totient is φ = 45742793760.

The previous prime is 91618180847. The next prime is 91618180889. The reversal of 91618180856 is 65808181619.

It is a junction number, because it is equal to n+sod(n) for n = 91618180798 and 91618180807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8281211 + ... + 8292266.

Almost surely, 2^91618180856 is an apocalyptic number.

It is an amenable number.

91618180856 is a deficient number, since it is larger than the sum of its proper divisors (80414520784).

91618180856 is a wasteful number, since it uses less digits than its factorization.

91618180856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16574174 (or 16574170 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 53.

The spelling of 91618180856 in words is "ninety-one billion, six hundred eighteen million, one hundred eighty thousand, eight hundred fifty-six".