18066901 has 4 divisors (see below), whose sum is σ = 18091404. Its totient is φ = 18042400.

The previous prime is 18066899. The next prime is 18066943. The reversal of 18066901 is 10966081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10966081 = 7 ⋅1566583.

It can be written as a sum of positive squares in 2 ways, for example, as 8910225 + 9156676 = 2985^2 + 3026^2 .

It is a cyclic number.

It is not a de Polignac number, because 18066901 - 2¹ = 18066899 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18066991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11110 + ... + 12631.

It is an arithmetic number, because the mean of its divisors is an integer number (4522851).

Almost surely, 2^18066901 is an apocalyptic number.

It is an amenable number.

18066901 is a deficient number, since it is larger than the sum of its proper divisors (24503).

18066901 is an equidigital number, since it uses as much as digits as its factorization.

18066901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24502.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 18066901 is about 4250.5177331709. The cubic root of 18066901 is about 262.3984235867.

It can be divided in two parts, 180 and 66901, that added together give a square (67081 = 259²).

The spelling of 18066901 in words is "eighteen million, sixty-six thousand, nine hundred one".