2066686815 has 16 divisors (see below), whose sum is σ = 3353273856. Its totient is φ = 1086708000.

The previous prime is 2066686813. The next prime is 2066686819. The reversal of 2066686815 is 5186866602.

It is a happy number.

It is not a de Polignac number, because 2066686815 - 2¹ = 2066686813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066686813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969211 + ... + 971340.

It is an arithmetic number, because the mean of its divisors is an integer number (209579616).

Almost surely, 2^2066686815 is an apocalyptic number.

2066686815 is a deficient number, since it is larger than the sum of its proper divisors (1286587041).

2066686815 is a wasteful number, since it uses less digits than its factorization.

2066686815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940630.

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 2066686815 is about 45460.8272582011. The cubic root of 2066686815 is about 1273.7715842437.

The spelling of 2066686815 in words is "two billion, sixty-six million, six hundred eighty-six thousand, eight hundred fifteen".