66218912 has 12 divisors (see below), whose sum is σ = 130368546. Its totient is φ = 33109440.

The previous prime is 66218903. The next prime is 66218921. The reversal of 66218912 is 21981266.

It is an interprime number because it is at equal distance from previous prime (66218903) and next prime (66218921).

It can be written as a sum of positive squares in only one way, i.e., 52940176 + 13278736 = 7276^2 + 3644^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1034639 + ... + 1034702.

Almost surely, 2^66218912 is an apocalyptic number.

It is an amenable number.

66218912 is a deficient number, since it is larger than the sum of its proper divisors (64149634).

66218912 is a wasteful number, since it uses less digits than its factorization.

66218912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069351 (or 2069343 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 66218912 is about 8137.5003533026. The cubic root of 66218912 is about 404.5703150025.

The spelling of 66218912 in words is "sixty-six million, two hundred eighteen thousand, nine hundred twelve".