91007666 has 8 divisors (see below), whose sum is σ = 137863404. Its totient is φ = 45053200.

The previous prime is 91007639. The next prime is 91007671. The reversal of 91007666 is 66670019.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 89965225 + 1042441 = 9485^2 + 1021^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225065 + ... + 225468.

Almost surely, 2^91007666 is an apocalyptic number.

91007666 is a deficient number, since it is larger than the sum of its proper divisors (46855738).

91007666 is a wasteful number, since it uses less digits than its factorization.

91007666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450636.

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

The square root of 91007666 is about 9539.7938132855. The cubic root of 91007666 is about 449.8067746561.

The spelling of 91007666 in words is "ninety-one million, seven thousand, six hundred sixty-six".