660776160 has 288 divisors, whose sum is σ = 2368106496. Its totient is φ = 154598400.

The previous prime is 660776159. The next prime is 660776261. The reversal of 660776160 is 61677066.

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 47 ways as a sum of consecutive naturals, for example, 1800297 + ... + 1800663.

It is an arithmetic number, because the mean of its divisors is an integer number (8222592).

Almost surely, 2^660776160 is an apocalyptic number.

660776160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660776160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1184053248).

660776160 is an abundant number, since it is smaller than the sum of its proper divisors (1707330336).

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

660776160 is a wasteful number, since it uses less digits than its factorization.

660776160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 660776160 is about 25705.5667122902. The cubic root of 660776160 is about 870.9999336533. Note that the first 4 decimals are identical.

The spelling of 660776160 in words is "six hundred sixty million, seven hundred seventy-six thousand, one hundred sixty".