6856700666 has 16 divisors (see below), whose sum is σ = 10642776840. Its totient is φ = 3309176640.

The previous prime is 6856700651. The next prime is 6856700681. The reversal of 6856700666 is 6660076586.

It is an interprime number because it is at equal distance from previous prime (6856700651) and next prime (6856700681).

It can be written as a sum of positive squares in 4 ways, for example, as 6483631441 + 373069225 = 80521^2 + 19315^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212096 + ... + 242276.

Almost surely, 2^6856700666 is an apocalyptic number.

6856700666 is a deficient number, since it is larger than the sum of its proper divisors (3786076174).

6856700666 is a wasteful number, since it uses less digits than its factorization.

6856700666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34129.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The square root of 6856700666 is about 82805.1970953514. The cubic root of 6856700666 is about 1899.7876647293.

The spelling of 6856700666 in words is "six billion, eight hundred fifty-six million, seven hundred thousand, six hundred sixty-six".