66418207 has 4 divisors (see below), whose sum is σ = 68708520. Its totient is φ = 64127896.

The previous prime is 66418193. The next prime is 66418267. The reversal of 66418207 is 70281466.

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 66418207 - 2¹¹ = 66416159 is a prime.

It is a super-2 number, since 2×66418207² = 8822756442189698, 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 (66418267) 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, 1145113 + ... + 1145170.

It is an arithmetic number, because the mean of its divisors is an integer number (17177130).

Almost surely, 2^66418207 is an apocalyptic number.

66418207 is a deficient number, since it is larger than the sum of its proper divisors (2290313).

66418207 is a wasteful number, since it uses less digits than its factorization.

66418207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290312.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66418207 is about 8149.7366215112. The cubic root of 66418207 is about 404.9757786663.

The spelling of 66418207 in words is "sixty-six million, four hundred eighteen thousand, two hundred seven".