6650668705 has 36 divisors (see below), whose sum is σ = 8551116756. Its totient is φ = 4964472000.

The previous prime is 6650668691. The next prime is 6650668709. The reversal of 6650668705 is 5078660566.

It can be written as a sum of positive squares in 2 ways, for example, as 4754240401 + 1896428304 = 68951^2 + 43548^2 .

It is not a de Polignac number, because 6650668705 - 2¹⁷ = 6650537633 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650668709) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 34820160 + ... + 34820350.

It is an arithmetic number, because the mean of its divisors is an integer number (237531021).

Almost surely, 2^6650668705 is an apocalyptic number.

It is an amenable number.

6650668705 is a deficient number, since it is larger than the sum of its proper divisors (1900448051).

6650668705 is a wasteful number, since it uses less digits than its factorization.

6650668705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

The square root of 6650668705 is about 81551.6321418523. The cubic root of 6650668705 is about 1880.5653861031.

The spelling of 6650668705 in words is "six billion, six hundred fifty million, six hundred sixty-eight thousand, seven hundred five".