56666719 has 2 divisors, whose sum is σ = 56666720. Its totient is φ = 56666718.

The previous prime is 56666717. The next prime is 56666723. The reversal of 56666719 is 91766665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56666719 - 2¹ = 56666717 is a prime.

It is a super-2 number, since 2×56666719² = 6422234084449922, which contains 22 as substring.

Together with 56666717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56666717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333359 + 28333360.

It is an arithmetic number, because the mean of its divisors is an integer number (28333360).

Almost surely, 2^56666719 is an apocalyptic number.

56666719 is a deficient number, since it is larger than the sum of its proper divisors (1).

56666719 is an equidigital number, since it uses as much as digits as its factorization.

56666719 is an evil number, because the sum of its binary digits is even.

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

The square root of 56666719 is about 7527.7300031284. The cubic root of 56666719 is about 384.0985690791.

It can be divided in two parts, 5 and 6666719, that added together give a square (6666724 = 2582²).

The spelling of 56666719 in words is "fifty-six million, six hundred sixty-six thousand, seven hundred nineteen".