66446719 has 4 divisors (see below), whose sum is σ = 66463720. Its totient is φ = 66429720.

The previous prime is 66446713. The next prime is 66446741. The reversal of 66446719 is 91764466.

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 66446719 - 2⁹ = 66446207 is a prime.

It is a super-2 number, since 2×66446719² = 8830332931729922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66446713) 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, 637 + ... + 11545.

It is an arithmetic number, because the mean of its divisors is an integer number (16615930).

Almost surely, 2^66446719 is an apocalyptic number.

66446719 is a deficient number, since it is larger than the sum of its proper divisors (17001).

66446719 is a wasteful number, since it uses less digits than its factorization.

66446719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17000.

The product of its digits is 217728, while the sum is 43.

The square root of 66446719 is about 8151.4856928047. The cubic root of 66446719 is about 405.0337196941.

The spelling of 66446719 in words is "sixty-six million, four hundred forty-six thousand, seven hundred nineteen".