1661416116 has 12 divisors (see below), whose sum is σ = 3876637632. Its totient is φ = 553805368.

The previous prime is 1661416111. The next prime is 1661416147. The reversal of 1661416116 is 6116141661.

It is a tau number, because it is divible by the number of its divisors (12).

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 (1661416111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69225660 + ... + 69225683.

It is an arithmetic number, because the mean of its divisors is an integer number (323053136).

Almost surely, 2^1661416116 is an apocalyptic number.

It is an amenable number.

1661416116 is an abundant number, since it is smaller than the sum of its proper divisors (2215221516).

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

1661416116 is a wasteful number, since it uses less digits than its factorization.

1661416116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138451350 (or 138451348 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1661416116 is about 40760.4724702744. The cubic root of 1661416116 is about 1184.3847485370.

Adding to 1661416116 its reverse (6116141661), we get a palindrome (7777557777).

The spelling of 1661416116 in words is "one billion, six hundred sixty-one million, four hundred sixteen thousand, one hundred sixteen".