660642216 has 64 divisors (see below), whose sum is σ = 1782285120. Its totient is φ = 202859520.

The previous prime is 660642187. The next prime is 660642221. The reversal of 660642216 is 612246066.

It is a super-2 number, since 2×660642216² = 872896275122781312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173776 + ... + 177536.

It is an arithmetic number, because the mean of its divisors is an integer number (27848205).

Almost surely, 2^660642216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660642216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891142560).

660642216 is an abundant number, since it is smaller than the sum of its proper divisors (1121642904).

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

660642216 is a wasteful number, since it uses less digits than its factorization.

660642216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346 (or 4342 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 660642216 is about 25702.9612301774. The cubic root of 660642216 is about 870.9410770611.

The spelling of 660642216 in words is "six hundred sixty million, six hundred forty-two thousand, two hundred sixteen".