66380386 has 4 divisors (see below), whose sum is σ = 99570582. Its totient is φ = 33190192.

The previous prime is 66380371. The next prime is 66380387. The reversal of 66380386 is 68308366.

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

It can be written as a sum of positive squares in only one way, i.e., 59521225 + 6859161 = 7715^2 + 2619^2 .

It is not an unprimeable number, because it can be changed into a prime (66380387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16595095 + ... + 16595098.

Almost surely, 2^66380386 is an apocalyptic number.

66380386 is a deficient number, since it is larger than the sum of its proper divisors (33190196).

66380386 is a wasteful number, since it uses less digits than its factorization.

66380386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33190195.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 66380386 is about 8147.4159093543. The cubic root of 66380386 is about 404.8988946420.

It can be divided in two parts, 66380 and 386, that added together give a palindrome (66766).

The spelling of 66380386 in words is "sixty-six million, three hundred eighty thousand, three hundred eighty-six".