18066772 has 6 divisors (see below), whose sum is σ = 31616858. Its totient is φ = 9033384.

The previous prime is 18066749. The next prime is 18066809. The reversal of 18066772 is 27766081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15888196 + 2178576 = 3986^2 + 1476^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2258343 + ... + 2258350.

Almost surely, 2^18066772 is an apocalyptic number.

It is an amenable number.

18066772 is a deficient number, since it is larger than the sum of its proper divisors (13550086).

18066772 is a wasteful number, since it uses less digits than its factorization.

18066772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516697 (or 4516695 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 18066772 is about 4250.5025585218. The cubic root of 18066772 is about 262.3977990657.

The spelling of 18066772 in words is "eighteen million, sixty-six thousand, seven hundred seventy-two".