660199616 has 56 divisors (see below), whose sum is σ = 1378458000. Its totient is φ = 313263104.

The previous prime is 660199577. The next prime is 660199619. The reversal of 660199616 is 616991066.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (660199619) 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, 106490 + ... + 112518.

Almost surely, 2^660199616 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 660199616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689229000).

660199616 is an abundant number, since it is smaller than the sum of its proper divisors (718258384).

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

660199616 is a wasteful number, since it uses less digits than its factorization.

660199616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6129 (or 6119 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 660199616 is about 25694.3498847509. The cubic root of 660199616 is about 870.7465367447.

The spelling of 660199616 in words is "six hundred sixty million, one hundred ninety-nine thousand, six hundred sixteen".