2660081664 has 112 divisors (see below), whose sum is σ = 7511539968. Its totient is φ = 834404352.

The previous prime is 2660081617. The next prime is 2660081707. The reversal of 2660081664 is 4661800662.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414609 + ... + 420975.

Almost surely, 2^2660081664 is an apocalyptic number.

2660081664 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 2660081664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3755769984).

2660081664 is an abundant number, since it is smaller than the sum of its proper divisors (4851458304).

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

2660081664 is an equidigital number, since it uses as much as digits as its factorization.

2660081664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413 (or 6389 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 2660081664 is about 51575.9795253566. The cubic root of 2660081664 is about 1385.5801613966.

The spelling of 2660081664 in words is "two billion, six hundred sixty million, eighty-one thousand, six hundred sixty-four".