91000010066 has 48 divisors (see below), whose sum is σ = 167368689600. Its totient is φ = 36249954624.

The previous prime is 91000010053. The next prime is 91000010089. The reversal of 91000010066 is 66001000019.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 686300 + ... + 808088.

It is an arithmetic number, because the mean of its divisors is an integer number (3486847700).

Almost surely, 2^91000010066 is an apocalyptic number.

91000010066 is a deficient number, since it is larger than the sum of its proper divisors (76368679534).

91000010066 is a wasteful number, since it uses less digits than its factorization.

91000010066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121923 (or 121870 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 91000010066 in words is "ninety-one billion, ten thousand, sixty-six".