66403018 has 16 divisors (see below), whose sum is σ = 109660320. Its totient is φ = 29905200.

The previous prime is 66403009. The next prime is 66403021. The reversal of 66403018 is 81030466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11448 + ... + 16243.

It is an arithmetic number, because the mean of its divisors is an integer number (6853770).

Almost surely, 2^66403018 is an apocalyptic number.

66403018 is a deficient number, since it is larger than the sum of its proper divisors (43257302).

66403018 is a wasteful number, since it uses less digits than its factorization.

66403018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27813.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66403018 is about 8148.8046976228. The cubic root of 66403018 is about 404.9449053745.

The spelling of 66403018 in words is "sixty-six million, four hundred three thousand, eighteen".