2666664064 has 64 divisors (see below), whose sum is σ = 5720608800. Its totient is φ = 1233571840.

The previous prime is 2666664053. The next prime is 2666664071. The reversal of 2666664064 is 4604666662.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×2666664064² = 14222194460457992192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117999 + ... + 138769.

Almost surely, 2^2666664064 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 2666664064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2860304400).

2666664064 is an abundant number, since it is smaller than the sum of its proper divisors (3053944736).

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

2666664064 is a wasteful number, since it uses less digits than its factorization.

2666664064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20861 (or 20849 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 46.

The square root of 2666664064 is about 51639.7527492144. The cubic root of 2666664064 is about 1386.7220975541.

The spelling of 2666664064 in words is "two billion, six hundred sixty-six million, six hundred sixty-four thousand, sixty-four".