66518404 has 12 divisors (see below), whose sum is σ = 118145104. Its totient is φ = 32762664.

The previous prime is 66518401. The next prime is 66518423. The reversal of 66518404 is 40481566.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66518404.

It is not an unprimeable number, because it can be changed into a prime (66518401) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 123834 + ... + 124369.

Almost surely, 2^66518404 is an apocalyptic number.

It is an amenable number.

66518404 is a deficient number, since it is larger than the sum of its proper divisors (51626700).

66518404 is a wasteful number, since it uses less digits than its factorization.

66518404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248274 (or 248272 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 66518404 is about 8155.8815587280. The cubic root of 66518404 is about 405.1793221037.

The spelling of 66518404 in words is "sixty-six million, five hundred eighteen thousand, four hundred four".