1661339200 has 42 divisors (see below), whose sum is σ = 4087936706. Its totient is φ = 664535040.

The previous prime is 1661339189. The next prime is 1661339227. The reversal of 1661339200 is 29331661.

It can be written as a sum of positive squares in 3 ways, for example, as 66455104 + 1594884096 = 8152^2 + 39936^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 517569 + ... + 520768.

Almost surely, 2^1661339200 is an apocalyptic number.

1661339200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661339200 is an abundant number, since it is smaller than the sum of its proper divisors (2426597506).

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

1661339200 is a wasteful number, since it uses less digits than its factorization.

1661339200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038359 (or 1038344 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 1661339200 is about 40759.5289472290. The cubic root of 1661339200 is about 1184.3664710483.

The spelling of 1661339200 in words is "one billion, six hundred sixty-one million, three hundred thirty-nine thousand, two hundred".