66166611666186 has 32 divisors (see below), whose sum is σ = 136897236993600. Its totient is φ = 21294877157120.

The previous prime is 66166611666151. The next prime is 66166611666187. The reversal of 66166611666186 is 68166611666166.

It is a happy number.

It is a super-2 number, since 2×66166611666186² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66166611666187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31537570 + ... + 33570098.

It is an arithmetic number, because the mean of its divisors is an integer number (4278038656050).

Almost surely, 2^{66166611666186} is an apocalyptic number.

66166611666186 is an abundant number, since it is smaller than the sum of its proper divisors (70730625327414).

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

66166611666186 is a wasteful number, since it uses less digits than its factorization.

66166611666186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219654.

The product of its digits is 80621568, while the sum is 66.

The spelling of 66166611666186 in words is "sixty-six trillion, one hundred sixty-six billion, six hundred eleven million, six hundred sixty-six thousand, one hundred eighty-six".