6661826385 has 16 divisors (see below), whose sum is σ = 10906805184. Its totient is φ = 3470346432.

The previous prime is 6661826383. The next prime is 6661826399. The reversal of 6661826385 is 5836281666.

It is not a de Polignac number, because 6661826385 - 2¹ = 6661826383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6661826383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5163562 + ... + 5164851.

It is an arithmetic number, because the mean of its divisors is an integer number (681675324).

Almost surely, 2^6661826385 is an apocalyptic number.

It is an amenable number.

6661826385 is a deficient number, since it is larger than the sum of its proper divisors (4244978799).

6661826385 is a wasteful number, since it uses less digits than its factorization.

6661826385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10328464.

The product of its digits is 2488320, while the sum is 51.

The square root of 6661826385 is about 81620.0121600089. The cubic root of 6661826385 is about 1881.6164595392.

The spelling of 6661826385 in words is "six billion, six hundred sixty-one million, eight hundred twenty-six thousand, three hundred eighty-five".