66636814 has 4 divisors (see below), whose sum is σ = 99955224. Its totient is φ = 33318406.

The previous prime is 66636811. The next prime is 66636833. The reversal of 66636814 is 41863666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66636811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16659202 + ... + 16659205.

It is an arithmetic number, because the mean of its divisors is an integer number (24988806).

Almost surely, 2^66636814 is an apocalyptic number.

66636814 is a deficient number, since it is larger than the sum of its proper divisors (33318410).

66636814 is a wasteful number, since it uses less digits than its factorization.

66636814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33318409.

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

The square root of 66636814 is about 8163.1375095609. The cubic root of 66636814 is about 405.4196006858.

The spelling of 66636814 in words is "sixty-six million, six hundred thirty-six thousand, eight hundred fourteen".