660998016 has 256 divisors, whose sum is σ = 2261952000. Its totient is φ = 186126336.

The previous prime is 660997999. The next prime is 660998047. The reversal of 660998016 is 610899066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2152935 + ... + 2153241.

It is an arithmetic number, because the mean of its divisors is an integer number (8835750).

Almost surely, 2^660998016 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 660998016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1130976000).

660998016 is an abundant number, since it is smaller than the sum of its proper divisors (1600953984).

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

660998016 is a wasteful number, since it uses less digits than its factorization.

660998016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 660998016 is about 25709.8816800078. The cubic root of 660998016 is about 871.0974023326.

The spelling of 660998016 in words is "six hundred sixty million, nine hundred ninety-eight thousand, sixteen".