66616418 has 32 divisors (see below), whose sum is σ = 114556032. Its totient is φ = 28758400.

The previous prime is 66616409. The next prime is 66616439. The reversal of 66616418 is 81461666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87158 + ... + 87918.

It is an arithmetic number, because the mean of its divisors is an integer number (3579876).

Almost surely, 2^66616418 is an apocalyptic number.

66616418 is a deficient number, since it is larger than the sum of its proper divisors (47939614).

66616418 is a wasteful number, since it uses less digits than its factorization.

66616418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970.

The product of its digits is 41472, while the sum is 38.

The square root of 66616418 is about 8161.8881393952. Note that the first 3 decimals coincide. The cubic root of 66616418 is about 405.3782332521.

The spelling of 66616418 in words is "sixty-six million, six hundred sixteen thousand, four hundred eighteen".