91665164 has 24 divisors (see below), whose sum is σ = 164619840. Its totient is φ = 44637264.

The previous prime is 91665149. The next prime is 91665187. The reversal of 91665164 is 46156619.

It is a super-2 number, since 2×91665164² = 16805004582293792, which contains 22 as substring.

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, 89447 + ... + 90465.

It is an arithmetic number, because the mean of its divisors is an integer number (6859160).

Almost surely, 2^91665164 is an apocalyptic number.

It is an amenable number.

91665164 is a deficient number, since it is larger than the sum of its proper divisors (72954676).

91665164 is a wasteful number, since it uses less digits than its factorization.

91665164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589 (or 1587 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 91665164 is about 9574.1926030345. The cubic root of 91665164 is about 450.8874077142.

The spelling of 91665164 in words is "ninety-one million, six hundred sixty-five thousand, one hundred sixty-four".