66518612 has 12 divisors (see below), whose sum is σ = 116663316. Its totient is φ = 33186240.

The previous prime is 66518593. The next prime is 66518629. The reversal of 66518612 is 21681566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 43612816 + 22905796 = 6604^2 + 4786^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16193 + ... + 19880.

It is an arithmetic number, because the mean of its divisors is an integer number (9721943).

Almost surely, 2^66518612 is an apocalyptic number.

It is an amenable number.

66518612 is a deficient number, since it is larger than the sum of its proper divisors (50144704).

66518612 is a wasteful number, since it uses less digits than its factorization.

66518612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36538 (or 36536 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 66518612 is about 8155.8943102519. The cubic root of 66518612 is about 405.1797444290.

The spelling of 66518612 in words is "sixty-six million, five hundred eighteen thousand, six hundred twelve".