2661266616 has 64 divisors (see below), whose sum is σ = 7065446400. Its totient is φ = 832946688.

The previous prime is 2661266591. The next prime is 2661266633. The reversal of 2661266616 is 6166621662.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25705 + ... + 77351.

It is an arithmetic number, because the mean of its divisors is an integer number (110397600).

Almost surely, 2^2661266616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2661266616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3532723200).

2661266616 is an abundant number, since it is smaller than the sum of its proper divisors (4404179784).

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

2661266616 is a wasteful number, since it uses less digits than its factorization.

2661266616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51788 (or 51784 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 2661266616 is about 51587.4656869283. The cubic root of 2661266616 is about 1385.7858696492.

The spelling of 2661266616 in words is "two billion, six hundred sixty-one million, two hundred sixty-six thousand, six hundred sixteen".