56667799 has 2 divisors, whose sum is σ = 56667800.
Its totient is φ = 56667798.
The previous prime is 56667797. The next prime is 56667803. The reversal of 56667799 is 99776665.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 56667799 - 21 = 56667797 is a prime.
It is a super-2 number, since 2×566677992 = 6422478887008802, which contains 22 as substring.
Together with 56667797, it forms a pair of twin primes.
It is a Chen prime.
It is a plaindrome in base 10.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (56667797) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333899 + 28333900.
It is an arithmetic number, because the mean of its divisors is an integer number (28333900).
Almost surely, 256667799 is an apocalyptic number.
56667799 is a deficient number, since it is larger than the sum of its proper divisors (1).
56667799 is an equidigital number, since it uses as much as digits as its factorization.
56667799 is an evil number, because the sum of its binary digits is even.
The product of its digits is 4286520, while the sum is 55.
The square root of 56667799 is about 7527.8017375592.
The cubic root of 56667799 is about 384.1010092169.
The spelling of 56667799 in words is "fifty-six million, six hundred sixty-seven thousand, seven hundred ninety-nine".