660111456 has 96 divisors (see below), whose sum is σ = 1807626240. Its totient is φ = 210663936.

The previous prime is 660111451. The next prime is 660111461. The reversal of 660111456 is 654111066.

It is an interprime number because it is at equal distance from previous prime (660111451) and next prime (660111461).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660111451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352635 + ... + 354501.

It is an arithmetic number, because the mean of its divisors is an integer number (18829440).

Almost surely, 2^660111456 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 660111456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903813120).

660111456 is an abundant number, since it is smaller than the sum of its proper divisors (1147514784).

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

660111456 is a wasteful number, since it uses less digits than its factorization.

660111456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 2028 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 660111456 is about 25692.6342752159. The cubic root of 660111456 is about 870.7077765324.

The spelling of 660111456 in words is "six hundred sixty million, one hundred eleven thousand, four hundred fifty-six".