66616318 has 16 divisors (see below), whose sum is σ = 106669440. Its totient is φ = 31109400.

The previous prime is 66616313. The next prime is 66616321. The reversal of 66616318 is 81361666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66616313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9648 + ... + 15043.

It is an arithmetic number, because the mean of its divisors is an integer number (6666840).

Almost surely, 2^66616318 is an apocalyptic number.

66616318 is a deficient number, since it is larger than the sum of its proper divisors (40053122).

66616318 is a wasteful number, since it uses less digits than its factorization.

66616318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24783.

The product of its digits is 31104, while the sum is 37.

The square root of 66616318 is about 8161.8820133594. The cubic root of 66616318 is about 405.3780304100.

The spelling of 66616318 in words is "sixty-six million, six hundred sixteen thousand, three hundred eighteen".