1660661200 has 120 divisors (see below), whose sum is σ = 4426904160. Its totient is φ = 593548800.

The previous prime is 1660661183. The next prime is 1660661231. The reversal of 1660661200 is 21660661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256402 + ... + 262798.

It is an arithmetic number, because the mean of its divisors is an integer number (36890868).

Almost surely, 2^1660661200 is an apocalyptic number.

1660661200 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 1660661200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213452080).

1660661200 is an abundant number, since it is smaller than the sum of its proper divisors (2766242960).

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

1660661200 is a wasteful number, since it uses less digits than its factorization.

1660661200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6485 (or 6474 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1660661200 is about 40751.2110249499. The cubic root of 1660661200 is about 1184.2053340314.

The spelling of 1660661200 in words is "one billion, six hundred sixty million, six hundred sixty-one thousand, two hundred".