218061966 has 8 divisors (see below), whose sum is σ = 436123944. Its totient is φ = 72687320.

The previous prime is 218061953. The next prime is 218061989. The reversal of 218061966 is 669160812.

It is a sphenic number, since it is the product of 3 distinct primes.

218061966 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18171825 + ... + 18171836.

It is an arithmetic number, because the mean of its divisors is an integer number (54515493).

Almost surely, 2^218061966 is an apocalyptic number.

218061966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

218061966 is a wasteful number, since it uses less digits than its factorization.

218061966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36343666.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 218061966 is about 14766.9213446812. The cubic root of 218061966 is about 601.9031845425.

It can be divided in two parts, 2180 and 61966, that added together give a palindrome (64146).

The spelling of 218061966 in words is "two hundred eighteen million, sixty-one thousand, nine hundred sixty-six".