660772116 has 108 divisors (see below), whose sum is σ = 1801560852. Its totient is φ = 203493888.

The previous prime is 660772103. The next prime is 660772141. The reversal of 660772116 is 611277066.

It can be written as a sum of positive squares in 2 ways, for example, as 561690000 + 99082116 = 23700^2 + 9954^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 3819406 + ... + 3819578.

It is an arithmetic number, because the mean of its divisors is an integer number (16681119).

Almost surely, 2^660772116 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 660772116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900780426).

660772116 is an abundant number, since it is smaller than the sum of its proper divisors (1140788736).

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

660772116 is a wasteful number, since it uses less digits than its factorization.

660772116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 660772116 is about 25705.4880521650. The cubic root of 660772116 is about 870.9981567879.

The spelling of 660772116 in words is "six hundred sixty million, seven hundred seventy-two thousand, one hundred sixteen".