66403319 has 4 divisors (see below), whose sum is σ = 67491960. Its totient is φ = 65314680.

The previous prime is 66403297. The next prime is 66403321. The reversal of 66403319 is 91330466.

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 66403319 - 2²⁴ = 49626103 is a prime.

It is a super-2 number, since 2×66403319² = 8818801548431522, 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 (66403349) 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, 544229 + ... + 544350.

It is an arithmetic number, because the mean of its divisors is an integer number (16872990).

Almost surely, 2^66403319 is an apocalyptic number.

66403319 is a deficient number, since it is larger than the sum of its proper divisors (1088641).

66403319 is a wasteful number, since it uses less digits than its factorization.

66403319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088640.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 66403319 is about 8148.8231665683. The cubic root of 66403319 is about 404.9455172354.

The spelling of 66403319 in words is "sixty-six million, four hundred three thousand, three hundred nineteen".