91861094268 has 18 divisors (see below), whose sum is σ = 232204432824. Its totient is φ = 30620364744.

The previous prime is 91861094257. The next prime is 91861094279. The reversal of 91861094268 is 86249016819.

91861094268 is a `hidden beast` number, since 9 + 18 + 610 + 9 + 4 + 2 + 6 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (91861094257) and next prime (91861094279).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×91861094268² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1275848496 + ... + 1275848567.

It is an arithmetic number, because the mean of its divisors is an integer number (12900246268).

Almost surely, 2^91861094268 is an apocalyptic number.

It is an amenable number.

91861094268 is an abundant number, since it is smaller than the sum of its proper divisors (140343338556).

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

91861094268 is a wasteful number, since it uses less digits than its factorization.

91861094268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551697073 (or 2551697068 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 91861094268 in words is "ninety-one billion, eight hundred sixty-one million, ninety-four thousand, two hundred sixty-eight".