56666791 has 8 divisors (see below), whose sum is σ = 59369984. Its totient is φ = 54018360.

The previous prime is 56666773. The next prime is 56666803. The reversal of 56666791 is 19766665.

56666791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 56666791 - 2⁷ = 56666663 is a prime.

It is a super-2 number, since 2×56666791² = 6422250404475362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56666191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11565 + ... + 15718.

It is an arithmetic number, because the mean of its divisors is an integer number (7421248).

Almost surely, 2^56666791 is an apocalyptic number.

56666791 is a deficient number, since it is larger than the sum of its proper divisors (2703193).

56666791 is a wasteful number, since it uses less digits than its factorization.

56666791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27381.

The product of its digits is 408240, while the sum is 46.

The square root of 56666791 is about 7527.7347854451. The cubic root of 56666791 is about 384.0987317559.

The spelling of 56666791 in words is "fifty-six million, six hundred sixty-six thousand, seven hundred ninety-one".