66186131 has 4 divisors (see below), whose sum is σ = 72203064. Its totient is φ = 60169200.

The previous prime is 66186097. The next prime is 66186137. The reversal of 66186131 is 13168166.

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

It is a cyclic number.

It is not a de Polignac number, because 66186131 - 2⁶ = 66186067 is a prime.

It is a super-2 number, since 2×66186131² = 8761207873498322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66186137) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3008450 + ... + 3008471.

It is an arithmetic number, because the mean of its divisors is an integer number (18050766).

Almost surely, 2^66186131 is an apocalyptic number.

66186131 is a deficient number, since it is larger than the sum of its proper divisors (6016933).

66186131 is a wasteful number, since it uses less digits than its factorization.

66186131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016932.

The product of its digits is 5184, while the sum is 32.

The square root of 66186131 is about 8135.4859105034. The cubic root of 66186131 is about 404.5035445078.

The spelling of 66186131 in words is "sixty-six million, one hundred eighty-six thousand, one hundred thirty-one".