66240418 has 4 divisors (see below), whose sum is σ = 99360630. Its totient is φ = 33120208.

The previous prime is 66240401. The next prime is 66240439. The reversal of 66240418 is 81404266.

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., 65173329 + 1067089 = 8073^2 + 1033^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66240418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16560103 + ... + 16560106.

Almost surely, 2^66240418 is an apocalyptic number.

66240418 is a deficient number, since it is larger than the sum of its proper divisors (33120212).

66240418 is a wasteful number, since it uses less digits than its factorization.

66240418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33120211.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 66240418 is about 8138.8216591838. The cubic root of 66240418 is about 404.6141078667.

The spelling of 66240418 in words is "sixty-six million, two hundred forty thousand, four hundred eighteen".