660660000 has 720 divisors, whose sum is σ = 2931711552. Its totient is φ = 126720000.

The previous prime is 660659983. The next prime is 660660031. The reversal of 660660000 is 66066.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 50819994 + ... + 50820006.

Almost surely, 2^660660000 is an apocalyptic number.

660660000 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 660660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1465855776).

660660000 is an abundant number, since it is smaller than the sum of its proper divisors (2271051552).

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

660660000 is a wasteful number, since it uses less digits than its factorization.

660660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 660660000 is about 25703.3071802054. The cubic root of 660660000 is about 870.9488920209.

Multiplying 660660000 by its reverse (66066), we get a square (43647163560000 = 6606600²).

660660000 divided by its reverse (66066) gives a 4-th power (10000 = 10⁴).

The spelling of 660660000 in words is "six hundred sixty million, six hundred sixty thousand".