91666751 has 8 divisors (see below), whose sum is σ = 101409408. Its totient is φ = 82159000.

The previous prime is 91666741. The next prime is 91666789. The reversal of 91666751 is 15766619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91666751 - 2¹⁰ = 91665727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91666699 and 91666708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91666741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57905 + ... + 59466.

It is an arithmetic number, because the mean of its divisors is an integer number (12676176).

Almost surely, 2^91666751 is an apocalyptic number.

91666751 is a deficient number, since it is larger than the sum of its proper divisors (9742657).

91666751 is a wasteful number, since it uses less digits than its factorization.

91666751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117453.

The product of its digits is 68040, while the sum is 41.

The square root of 91666751 is about 9574.2754817271. The cubic root of 91666751 is about 450.8900097721.

The spelling of 91666751 in words is "ninety-one million, six hundred sixty-six thousand, seven hundred fifty-one".