56666731 has 4 divisors (see below), whose sum is σ = 61818264. Its totient is φ = 51515200.

The previous prime is 56666723. The next prime is 56666773. The reversal of 56666731 is 13766665.

56666731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 56666731 - 2³ = 56666723 is a prime.

It is a super-2 number, since 2×56666731² = 6422236804452722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56669731) 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 3 ways as a sum of consecutive naturals, for example, 2575750 + ... + 2575771.

It is an arithmetic number, because the mean of its divisors is an integer number (15454566).

Almost surely, 2^56666731 is an apocalyptic number.

56666731 is a deficient number, since it is larger than the sum of its proper divisors (5151533).

56666731 is a wasteful number, since it uses less digits than its factorization.

56666731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151532.

The product of its digits is 136080, while the sum is 40.

The square root of 56666731 is about 7527.7308001814. The cubic root of 56666731 is about 384.0985961919.

The spelling of 56666731 in words is "fifty-six million, six hundred sixty-six thousand, seven hundred thirty-one".