18066284461 has 4 divisors (see below), whose sum is σ = 18232030300. Its totient is φ = 17900538624.

The previous prime is 18066284459. The next prime is 18066284471. The reversal of 18066284461 is 16448266081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8195861961 + 9870422500 = 90531^2 + 99350^2 .

It is a cyclic number.

It is not a de Polignac number, because 18066284461 - 2¹ = 18066284459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18066284441) 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, 82872756 + ... + 82872973.

It is an arithmetic number, because the mean of its divisors is an integer number (4558007575).

Almost surely, 2^18066284461 is an apocalyptic number.

It is an amenable number.

18066284461 is a deficient number, since it is larger than the sum of its proper divisors (165745839).

18066284461 is a wasteful number, since it uses less digits than its factorization.

18066284461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165745838.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 18066284461 in words is "eighteen billion, sixty-six million, two hundred eighty-four thousand, four hundred sixty-one".