2666601816 has 64 divisors (see below), whose sum is σ = 7113590400. Its totient is φ = 830539008.

The previous prime is 2666601767. The next prime is 2666601887. The reversal of 2666601816 is 6181066662.

It is a super-2 number, since 2×2666601816² = 14221530490188995712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6766 + ... + 73341.

It is an arithmetic number, because the mean of its divisors is an integer number (111149850).

Almost surely, 2^2666601816 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 2666601816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3556795200).

2666601816 is an abundant number, since it is smaller than the sum of its proper divisors (4446988584).

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

2666601816 is a wasteful number, since it uses less digits than its factorization.

2666601816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80208 (or 80204 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 2666601816 is about 51639.1500317346. The cubic root of 2666601816 is about 1386.7113073749.

The spelling of 2666601816 in words is "two billion, six hundred sixty-six million, six hundred one thousand, eight hundred sixteen".