91686627618881 has 8 divisors (see below), whose sum is σ = 91718134873344. Its totient is φ = 91655121149280.

The previous prime is 91686627618869. The next prime is 91686627618959. The reversal of 91686627618881 is 18881672668619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91686627618881 is a prime.

It is a super-2 number, since 2×91686627618881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91686627618581) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 325257860 + ... + 325539626.

It is an arithmetic number, because the mean of its divisors is an integer number (11464766859168).

Almost surely, 2^{91686627618881} is an apocalyptic number.

It is an amenable number.

91686627618881 is a deficient number, since it is larger than the sum of its proper divisors (31507254463).

91686627618881 is a wasteful number, since it uses less digits than its factorization.

91686627618881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392431.

The product of its digits is 668860416, while the sum is 77.

The spelling of 91686627618881 in words is "ninety-one trillion, six hundred eighty-six billion, six hundred twenty-seven million, six hundred eighteen thousand, eight hundred eighty-one".