1661152200 has 48 divisors (see below), whose sum is σ = 5149573680. Its totient is φ = 442973760.

The previous prime is 1661152189. The next prime is 1661152201. The reversal of 1661152200 is 22511661.

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

It is not an unprimeable number, because it can be changed into a prime (1661152201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1383694 + ... + 1384893.

It is an arithmetic number, because the mean of its divisors is an integer number (107282785).

Almost surely, 2^1661152200 is an apocalyptic number.

1661152200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661152200 is an abundant number, since it is smaller than the sum of its proper divisors (3488421480).

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

1661152200 is a wasteful number, since it uses less digits than its factorization.

1661152200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768606 (or 2768597 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1661152200 is about 40757.2349405599. The cubic root of 1661152200 is about 1184.3220320318.

Adding to 1661152200 its reverse (22511661), we get a palindrome (1683663861).

The spelling of 1661152200 in words is "one billion, six hundred sixty-one million, one hundred fifty-two thousand, two hundred".