2066805864 has 144 divisors (see below), whose sum is σ = 5962619520. Its totient is φ = 646626240.

The previous prime is 2066805863. The next prime is 2066805893. The reversal of 2066805864 is 4685086602.

2066805864 is a `hidden beast` number, since 2 + 0 + 6 + 68 + 0 + 586 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (2066805863) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3404649 + ... + 3405255.

It is an arithmetic number, because the mean of its divisors is an integer number (41407080).

Almost surely, 2^2066805864 is an apocalyptic number.

2066805864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2066805864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2981309760).

2066805864 is an abundant number, since it is smaller than the sum of its proper divisors (3895813656).

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

2066805864 is a wasteful number, since it uses less digits than its factorization.

2066805864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 2066805864 is about 45462.1365973928. The cubic root of 2066805864 is about 1273.7960417991.

The spelling of 2066805864 in words is "two billion, sixty-six million, eight hundred five thousand, eight hundred sixty-four".