91668501 has 12 divisors (see below), whose sum is σ = 138167328. Its totient is φ = 58455144.

The previous prime is 91668469. The next prime is 91668517. The reversal of 91668501 is 10586619.

91668501 is a `hidden beast` number, since 91 + 6 + 68 + 501 = 666.

It is not a de Polignac number, because 91668501 - 2⁵ = 91668469 is a prime.

It is a super-2 number, since 2×91668501² = 16806228151174002, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91668571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221215 + ... + 221628.

It is an arithmetic number, because the mean of its divisors is an integer number (11513944).

Almost surely, 2^91668501 is an apocalyptic number.

It is an amenable number.

91668501 is a deficient number, since it is larger than the sum of its proper divisors (46498827).

91668501 is a wasteful number, since it uses less digits than its factorization.

91668501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442872 (or 442869 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 91668501 is about 9574.3668720182. The cubic root of 91668501 is about 450.8928790512.

The spelling of 91668501 in words is "ninety-one million, six hundred sixty-eight thousand, five hundred one".