2661512216 has 16 divisors (see below), whose sum is σ = 5444002440. Its totient is φ = 1209778240.

The previous prime is 2661512213. The next prime is 2661512237. The reversal of 2661512216 is 6122151662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661512213) 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, 15122141 + ... + 15122316.

Almost surely, 2^2661512216 is an apocalyptic number.

It is an amenable number.

2661512216 is an abundant number, since it is smaller than the sum of its proper divisors (2782490224).

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

2661512216 is a wasteful number, since it uses less digits than its factorization.

2661512216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30244474 (or 30244470 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 2661512216 is about 51589.8460552074. The cubic root of 2661512216 is about 1385.8284982906.

Adding to 2661512216 its reverse (6122151662), we get a palindrome (8783663878).

The spelling of 2661512216 in words is "two billion, six hundred sixty-one million, five hundred twelve thousand, two hundred sixteen".