186531066 has 16 divisors (see below), whose sum is σ = 414513600. Its totient is φ = 62177004.

The previous prime is 186531049. The next prime is 186531071. The reversal of 186531066 is 660135681.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 186531066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1727086 + ... + 1727193.

It is an arithmetic number, because the mean of its divisors is an integer number (25907100).

Almost surely, 2^186531066 is an apocalyptic number.

186531066 is an abundant number, since it is smaller than the sum of its proper divisors (227982534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

186531066 is a wasteful number, since it uses less digits than its factorization.

186531066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454290 (or 3454284 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 186531066 is about 13657.6376434580. The cubic root of 186531066 is about 571.3695047221.

The spelling of 186531066 in words is "one hundred eighty-six million, five hundred thirty-one thousand, sixty-six".