1661119992 has 144 divisors (see below), whose sum is σ = 5509038600. Its totient is φ = 449608320.

The previous prime is 1661119991. The next prime is 1661120009. The reversal of 1661119992 is 2999111661.

1661119992 is a `hidden beast` number, since 16 + 611 + 19 + 9 + 9 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661119991) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 54642 + ... + 79422.

Almost surely, 2^1661119992 is an apocalyptic number.

1661119992 is a gapful number since it is divisible by the number (12) 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 1661119992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2754519300).

1661119992 is an abundant number, since it is smaller than the sum of its proper divisors (3847918608).

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

1661119992 is a wasteful number, since it uses less digits than its factorization.

1661119992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24826 (or 24812 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The square root of 1661119992 is about 40756.8398186120. The cubic root of 1661119992 is about 1184.3143777280.

The spelling of 1661119992 in words is "one billion, six hundred sixty-one million, one hundred nineteen thousand, nine hundred ninety-two".