66397319 has 4 divisors (see below), whose sum is σ = 68539200. Its totient is φ = 64255440.

The previous prime is 66397313. The next prime is 66397333. The reversal of 66397319 is 91379366.

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 66397319 - 2⁸ = 66397063 is a prime.

It is a super-2 number, since 2×66397319² = 8817207940775522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66397319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66397313) 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, 1070894 + ... + 1070955.

It is an arithmetic number, because the mean of its divisors is an integer number (17134800).

Almost surely, 2^66397319 is an apocalyptic number.

66397319 is a deficient number, since it is larger than the sum of its proper divisors (2141881).

66397319 is a wasteful number, since it uses less digits than its factorization.

66397319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141880.

The product of its digits is 183708, while the sum is 44.

The square root of 66397319 is about 8148.4550069323. The cubic root of 66397319 is about 404.9333203235.

The spelling of 66397319 in words is "sixty-six million, three hundred ninety-seven thousand, three hundred nineteen".