2666689440 has 96 divisors (see below), whose sum is σ = 8671090176. Its totient is φ = 688174080.

The previous prime is 2666689439. The next prime is 2666689453. The reversal of 2666689440 is 449866662.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×2666689440² = 14222465138815027200, which contains 22 as substring.

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, 74727 + ... + 104486.

It is an arithmetic number, because the mean of its divisors is an integer number (90323856).

Almost surely, 2^2666689440 is an apocalyptic number.

2666689440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2666689440 is an abundant number, since it is smaller than the sum of its proper divisors (6004400736).

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

2666689440 is a wasteful number, since it uses less digits than its factorization.

2666689440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179262 (or 179254 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The square root of 2666689440 is about 51639.9984508133. The cubic root of 2666689440 is about 1386.7264962269.

The spelling of 2666689440 in words is "two billion, six hundred sixty-six million, six hundred eighty-nine thousand, four hundred forty".