66440379 has 4 divisors (see below), whose sum is σ = 88587176. Its totient is φ = 44293584.

The previous prime is 66440371. The next prime is 66440383. The reversal of 66440379 is 97304466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66440379 - 2³ = 66440371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66440371) 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, 11073394 + ... + 11073399.

It is an arithmetic number, because the mean of its divisors is an integer number (22146794).

Almost surely, 2^66440379 is an apocalyptic number.

66440379 is a deficient number, since it is larger than the sum of its proper divisors (22146797).

66440379 is a wasteful number, since it uses less digits than its factorization.

66440379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22146796.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 66440379 is about 8151.0967973641. The cubic root of 66440379 is about 405.0208372148.

The spelling of 66440379 in words is "sixty-six million, four hundred forty thousand, three hundred seventy-nine".