186666481 has 8 divisors (see below), whose sum is σ = 192331944. Its totient is φ = 181054080.

The previous prime is 186666479. The next prime is 186666499. The reversal of 186666481 is 184666681.

It can be written as a sum of positive squares in 4 ways, for example, as 31539456 + 155127025 = 5616^2 + 12455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 186666481 - 2¹ = 186666479 is a prime.

It is a super-2 number, since 2×186666481² = 69688750257846722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (186669481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6066 + ... + 20251.

It is an arithmetic number, because the mean of its divisors is an integer number (24041493).

Almost surely, 2^186666481 is an apocalyptic number.

It is an amenable number.

186666481 is a deficient number, since it is larger than the sum of its proper divisors (5665463).

186666481 is a wasteful number, since it uses less digits than its factorization.

186666481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26531.

The product of its digits is 331776, while the sum is 46.

The square root of 186666481 is about 13662.5942265735. The cubic root of 186666481 is about 571.5077360054.

The spelling of 186666481 in words is "one hundred eighty-six million, six hundred sixty-six thousand, four hundred eighty-one".