66218007186 has 48 divisors (see below), whose sum is σ = 149744813400. Its totient is φ = 21127991040.

The previous prime is 66218007169. The next prime is 66218007221. The reversal of 66218007186 is 68170081266.

It is a happy number.

66218007186 is a `hidden beast` number, since 6 + 621 + 8 + 0 + 0 + 7 + 18 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 41160700161 + 25057307025 = 202881^2 + 158295^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 807361 + ... + 885588.

Almost surely, 2^66218007186 is an apocalyptic number.

66218007186 is an abundant number, since it is smaller than the sum of its proper divisors (83526806214).

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

66218007186 is a wasteful number, since it uses less digits than its factorization.

66218007186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693051 (or 1693048 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 66218007186 in words is "sixty-six billion, two hundred eighteen million, seven thousand, one hundred eighty-six".