1660121200 has 60 divisors (see below), whose sum is σ = 4198378360. Its totient is φ = 629095680.

The previous prime is 1660121159. The next prime is 1660121237. The reversal of 1660121200 is 21210661.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101619 + ... + 116818.

Almost surely, 2^1660121200 is an apocalyptic number.

1660121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660121200 is an abundant number, since it is smaller than the sum of its proper divisors (2538257160).

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

1660121200 is a wasteful number, since it uses less digits than its factorization.

1660121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218474 (or 218463 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1660121200 is about 40744.5849162806. The cubic root of 1660121200 is about 1184.0769634351.

Adding to 1660121200 its reverse (21210661), we get a palindrome (1681331861).

The spelling of 1660121200 in words is "one billion, six hundred sixty million, one hundred twenty-one thousand, two hundred".