56666699 has 4 divisors (see below), whose sum is σ = 57735936.
Its totient is φ = 55597464.
The previous prime is 56666693. The next prime is 56666707. The reversal of 56666699 is 99666665.
It is a happy number.
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 56666699 - 212 = 56662603 is a prime.
It is a super-2 number, since 2×566666992 = 6422229551113202, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1069183 = 56666699 / (5 + 6 + 6 + 6 + 6 + 6 + 9 + 9).
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 56666699.
It is not an unprimeable number, because it can be changed into a prime (56666693) 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, 534539 + ... + 534644.
It is an arithmetic number, because the mean of its divisors is an integer number (14433984).
Almost surely, 256666699 is an apocalyptic number.
56666699 is a deficient number, since it is larger than the sum of its proper divisors (1069237).
56666699 is a wasteful number, since it uses less digits than its factorization.
56666699 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1069236.
The product of its digits is 3149280, while the sum is 53.
The square root of 56666699 is about 7527.7286747066.
The cubic root of 56666699 is about 384.0985238910.
The spelling of 56666699 in words is "fifty-six million, six hundred sixty-six thousand, six hundred ninety-nine".