56666789 has 4 divisors (see below), whose sum is σ = 57217056. Its totient is φ = 56116524.

The previous prime is 56666773. The next prime is 56666803. The reversal of 56666789 is 98766665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98766665 = 5 ⋅19753333.

It is a cyclic number.

It is not a de Polignac number, because 56666789 - 2⁴ = 56666773 is a prime.

It is a super-2 number, since 2×56666789² = 6422249951141042, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 56666789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56666719) 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, 274979 + ... + 275184.

It is an arithmetic number, because the mean of its divisors is an integer number (14304264).

Almost surely, 2^56666789 is an apocalyptic number.

It is an amenable number.

56666789 is a deficient number, since it is larger than the sum of its proper divisors (550267).

56666789 is a wasteful number, since it uses less digits than its factorization.

56666789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550266.

The product of its digits is 3265920, while the sum is 53.

The square root of 56666789 is about 7527.7346526030. The cubic root of 56666789 is about 384.0987272371.

The spelling of 56666789 in words is "fifty-six million, six hundred sixty-six thousand, seven hundred eighty-nine".