1215766116 has 36 divisors (see below), whose sum is σ = 3077115132. Its totient is φ = 404737344.

The previous prime is 1215766073. The next prime is 1215766117. The reversal of 1215766116 is 6116675121.

It is a happy number.

1215766116 is a `hidden beast` number, since 1 + 21 + 576 + 61 + 1 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 285272100 + 930494016 = 16890^2 + 30504^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1215766117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7506 + ... + 49878.

Almost surely, 2^1215766116 is an apocalyptic number.

It is an amenable number.

1215766116 is an abundant number, since it is smaller than the sum of its proper divisors (1861349016).

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

1215766116 is a wasteful number, since it uses less digits than its factorization.

1215766116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43180 (or 43175 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 1215766116 is about 34867.8378452120. The cubic root of 1215766116 is about 1067.2922234725.

The spelling of 1215766116 in words is "one billion, two hundred fifteen million, seven hundred sixty-six thousand, one hundred sixteen".