91660607 has 4 divisors (see below), whose sum is σ = 92501640. Its totient is φ = 90819576.

The previous prime is 91660567. The next prime is 91660643. The reversal of 91660607 is 70606619.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91660607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91660697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420353 + ... + 420570.

It is an arithmetic number, because the mean of its divisors is an integer number (23125410).

Almost surely, 2^91660607 is an apocalyptic number.

91660607 is a deficient number, since it is larger than the sum of its proper divisors (841033).

91660607 is a wasteful number, since it uses less digits than its factorization.

91660607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841032.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 91660607 is about 9573.9546165626. The cubic root of 91660607 is about 450.8799358536.

The spelling of 91660607 in words is "ninety-one million, six hundred sixty thousand, six hundred seven".