1661100112 has 40 divisors (see below), whose sum is σ = 3838075776. Its totient is φ = 680946816.

The previous prime is 1661100059. The next prime is 1661100151. The reversal of 1661100112 is 2110011661.

It is a self number, because there is not a number n which added to its sum of digits gives 1661100112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319843 + ... + 324994.

Almost surely, 2^1661100112 is an apocalyptic number.

It is an amenable number.

1661100112 is an abundant number, since it is smaller than the sum of its proper divisors (2176975664).

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

1661100112 is a wasteful number, since it uses less digits than its factorization.

1661100112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644875 (or 644869 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1661100112 is about 40756.5959324377. The cubic root of 1661100112 is about 1184.3096531519.

Adding to 1661100112 its reverse (2110011661), we get a palindrome (3771111773).

The spelling of 1661100112 in words is "one billion, six hundred sixty-one million, one hundred thousand, one hundred twelve".