660221068 has 24 divisors (see below), whose sum is σ = 1251912368. Its totient is φ = 302844096.

The previous prime is 660221017. The next prime is 660221071. The reversal of 660221068 is 860122066.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30471 + ... + 47422.

Almost surely, 2^660221068 is an apocalyptic number.

It is an amenable number.

660221068 is a deficient number, since it is larger than the sum of its proper divisors (591691300).

660221068 is a wasteful number, since it uses less digits than its factorization.

660221068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78073 (or 78071 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 660221068 is about 25694.7673272205. The cubic root of 660221068 is about 870.7559677572.

The spelling of 660221068 in words is "six hundred sixty million, two hundred twenty-one thousand, sixty-eight".