66513118 has 16 divisors (see below), whose sum is σ = 114357600. Its totient is φ = 28421856.

The previous prime is 66513113. The next prime is 66513121. The reversal of 66513118 is 81131566.

It is a self number, because there is not a number n which added to its sum of digits gives 66513118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66513113) 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, 1921 + ... + 11692.

It is an arithmetic number, because the mean of its divisors is an integer number (7147350).

Almost surely, 2^66513118 is an apocalyptic number.

66513118 is a deficient number, since it is larger than the sum of its proper divisors (47844482).

66513118 is a wasteful number, since it uses less digits than its factorization.

66513118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13971.

The product of its digits is 4320, while the sum is 31.

The square root of 66513118 is about 8155.5574916740. The cubic root of 66513118 is about 405.1685890609.

The spelling of 66513118 in words is "sixty-six million, five hundred thirteen thousand, one hundred eighteen".