91892091666 has 16 divisors (see below), whose sum is σ = 184082058144. Its totient is φ = 30581051424.

The previous prime is 91892091653. The next prime is 91892091671. The reversal of 91892091666 is 66619029819.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12407440 + ... + 12414843.

It is an arithmetic number, because the mean of its divisors is an integer number (11505128634).

Almost surely, 2^91892091666 is an apocalyptic number.

91892091666 is an abundant number, since it is smaller than the sum of its proper divisors (92189966478).

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

91892091666 is a wasteful number, since it uses less digits than its factorization.

91892091666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24822905.

The product of its (nonzero) digits is 2519424, while the sum is 57.

The spelling of 91892091666 in words is "ninety-one billion, eight hundred ninety-two million, ninety-one thousand, six hundred sixty-six".