218939066 has 16 divisors (see below), whose sum is σ = 338667264. Its totient is φ = 106095504.

The previous prime is 218939059. The next prime is 218939069. The reversal of 218939066 is 660939812.

It is not an unprimeable number, because it can be changed into a prime (218939069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625 + ... + 20988.

It is an arithmetic number, because the mean of its divisors is an integer number (21166704).

Almost surely, 2^218939066 is an apocalyptic number.

218939066 is a deficient number, since it is larger than the sum of its proper divisors (119728198).

218939066 is a wasteful number, since it uses less digits than its factorization.

218939066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22765.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 218939066 is about 14796.5896746514. The cubic root of 218939066 is about 602.7091068971.

The spelling of 218939066 in words is "two hundred eighteen million, nine hundred thirty-nine thousand, sixty-six".