91660205 has 16 divisors (see below), whose sum is σ = 135375744. Its totient is φ = 58017600.

The previous prime is 91660193. The next prime is 91660223. The reversal of 91660205 is 50206619.

It is not a de Polignac number, because 91660205 - 2¹² = 91656109 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100271 + ... + 101180.

It is an arithmetic number, because the mean of its divisors is an integer number (8460984).

Almost surely, 2^91660205 is an apocalyptic number.

It is an amenable number.

91660205 is a deficient number, since it is larger than the sum of its proper divisors (43715539).

91660205 is a wasteful number, since it uses less digits than its factorization.

91660205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201476.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 91660205 is about 9573.9336220803. The cubic root of 91660205 is about 450.8792767046.

The spelling of 91660205 in words is "ninety-one million, six hundred sixty thousand, two hundred five".