660555456 has 84 divisors (see below), whose sum is σ = 1921114776. Its totient is φ = 200161280.

The previous prime is 660555439. The next prime is 660555457. The reversal of 660555456 is 654555066.

660555456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (660555457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9016 + ... + 37448.

It is an arithmetic number, because the mean of its divisors is an integer number (22870414).

Almost surely, 2^660555456 is an apocalyptic number.

660555456 is a gapful number since it is divisible by the number (66) 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 660555456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960557388).

660555456 is an abundant number, since it is smaller than the sum of its proper divisors (1260559320).

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

660555456 is a wasteful number, since it uses less digits than its factorization.

660555456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28470 (or 28449 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

The square root of 660555456 is about 25701.2734314858. The cubic root of 660555456 is about 870.9029494361.

The spelling of 660555456 in words is "six hundred sixty million, five hundred fifty-five thousand, four hundred fifty-six".