1660204800 has 648 divisors, whose sum is σ = 6573381360. Its totient is φ = 398131200.

The previous prime is 1660204787. The next prime is 1660204801. The reversal of 1660204800 is 84020661.

1660204800 is a `hidden beast` number, since 16 + 602 + 0 + 48 + 0 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660204801) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40492780 + ... + 40492820.

Almost surely, 2^1660204800 is an apocalyptic number.

1660204800 is a gapful number since it is divisible by the number (10) 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 1660204800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3286690680).

1660204800 is an abundant number, since it is smaller than the sum of its proper divisors (4913176560).

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

1660204800 is a wasteful number, since it uses less digits than its factorization.

1660204800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1660204800 is about 40745.6108065642. The cubic root of 1660204800 is about 1184.0968389262.

It can be divided in two parts, 166020 and 4800, that added together give a triangular number (170820 = T₅₈₄).

The spelling of 1660204800 in words is "one billion, six hundred sixty million, two hundred four thousand, eight hundred".