66186741 has 4 divisors (see below), whose sum is σ = 88248992. Its totient is φ = 44124492.

The previous prime is 66186739. The next prime is 66186793. The reversal of 66186741 is 14768166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66186741 - 2¹ = 66186739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66186741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66186721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11031121 + ... + 11031126.

It is an arithmetic number, because the mean of its divisors is an integer number (22062248).

Almost surely, 2^66186741 is an apocalyptic number.

It is an amenable number.

66186741 is a deficient number, since it is larger than the sum of its proper divisors (22062251).

66186741 is a wasteful number, since it uses less digits than its factorization.

66186741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22062250.

The product of its digits is 48384, while the sum is 39.

The square root of 66186741 is about 8135.5234004949. The cubic root of 66186741 is about 404.5047871972.

The spelling of 66186741 in words is "sixty-six million, one hundred eighty-six thousand, seven hundred forty-one".