206782126785 has 48 divisors (see below), whose sum is σ = 399303450000. Its totient is φ = 98290063872.

The previous prime is 206782126783. The next prime is 206782126801. The reversal of 206782126785 is 587621287602.

It can be written as a sum of positive squares in 8 ways, for example, as 2582977329 + 204199149456 = 50823^2 + 451884^2 .

It is not a de Polignac number, because 206782126785 - 2¹ = 206782126783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206782126783) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6077410 + ... + 6111339.

It is an arithmetic number, because the mean of its divisors is an integer number (8318821875).

Almost surely, 2^206782126785 is an apocalyptic number.

It is an amenable number.

206782126785 is a deficient number, since it is larger than the sum of its proper divisors (192521323215).

206782126785 is a wasteful number, since it uses less digits than its factorization.

206782126785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12188802 (or 12188799 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 206782126785 in words is "two hundred six billion, seven hundred eighty-two million, one hundred twenty-six thousand, seven hundred eighty-five".