91106642068 has 12 divisors (see below), whose sum is σ = 171700979380. Its totient is φ = 42049219392.

The previous prime is 91106642051. The next prime is 91106642083. The reversal of 91106642068 is 86024660119.

It can be written as a sum of positive squares in 2 ways, for example, as 19717214724 + 71389427344 = 140418^2 + 267188^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876025353 + ... + 876025456.

Almost surely, 2^91106642068 is an apocalyptic number.

It is an amenable number.

91106642068 is a deficient number, since it is larger than the sum of its proper divisors (80594337312).

91106642068 is a wasteful number, since it uses less digits than its factorization.

91106642068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752050826 (or 1752050824 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 91106642068 in words is "ninety-one billion, one hundred six million, six hundred forty-two thousand, sixty-eight".