91660217474 has 16 divisors (see below), whose sum is σ = 157167210816. Its totient is φ = 39274098000.

The previous prime is 91660217461. The next prime is 91660217503. The reversal of 91660217474 is 47471206619.

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, 673157 + ... + 797784.

It is an arithmetic number, because the mean of its divisors is an integer number (9822950676).

Almost surely, 2^91660217474 is an apocalyptic number.

91660217474 is a deficient number, since it is larger than the sum of its proper divisors (65506993342).

91660217474 is a wasteful number, since it uses less digits than its factorization.

91660217474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475401.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 91660217474 in words is "ninety-one billion, six hundred sixty million, two hundred seventeen thousand, four hundred seventy-four".