66703818 has 32 divisors (see below), whose sum is σ = 147401856. Its totient is φ = 20016128.

The previous prime is 66703811. The next prime is 66703849. The reversal of 66703818 is 81830766.

It is not an unprimeable number, because it can be changed into a prime (66703811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11871 + ... + 16562.

It is an arithmetic number, because the mean of its divisors is an integer number (4606308).

Almost surely, 2^66703818 is an apocalyptic number.

66703818 is an abundant number, since it is smaller than the sum of its proper divisors (80698038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66703818 is a wasteful number, since it uses less digits than its factorization.

66703818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28478.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 66703818 is about 8167.2405376602. The cubic root of 66703818 is about 405.5554396892. Note that the first 3 decimals are identical.

The spelling of 66703818 in words is "sixty-six million, seven hundred three thousand, eight hundred eighteen".