27066691 has 4 divisors (see below), whose sum is σ = 27447984. Its totient is φ = 26685400.

The previous prime is 27066673. The next prime is 27066707. The reversal of 27066691 is 19666072.

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

It is a cyclic number.

It is not a de Polignac number, because 27066691 - 2⁷ = 27066563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27066691.

It is not an unprimeable number, because it can be changed into a prime (27066661) 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, 190540 + ... + 190681.

It is an arithmetic number, because the mean of its divisors is an integer number (6861996).

Almost surely, 2^27066691 is an apocalyptic number.

27066691 is a deficient number, since it is larger than the sum of its proper divisors (381293).

27066691 is an equidigital number, since it uses as much as digits as its factorization.

27066691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381292.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 27066691 is about 5202.5658092906. The cubic root of 27066691 is about 300.2468006129.

The spelling of 27066691 in words is "twenty-seven million, sixty-six thousand, six hundred ninety-one".