2600660066 has 8 divisors (see below), whose sum is σ = 3901243500. Its totient is φ = 1300245568.

The previous prime is 2600660063. The next prime is 2600660099. The reversal of 2600660066 is 6600660062.

It can be written as a sum of positive squares in 2 ways, for example, as 2472177841 + 128482225 = 49721^2 + 11335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

2600660066 is a modest number, since divided by 660066 gives 26 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2600660063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8390 + ... + 72606.

Almost surely, 2^2600660066 is an apocalyptic number.

2600660066 is a deficient number, since it is larger than the sum of its proper divisors (1300583434).

2600660066 is a wasteful number, since it uses less digits than its factorization.

2600660066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84468.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 2600660066 is about 50996.6672048282. The cubic root of 2600660066 is about 1375.1852208447.

The spelling of 2600660066 in words is "two billion, six hundred million, six hundred sixty thousand, sixty-six".