646586852266 has 16 divisors (see below), whose sum is σ = 1003354338600. Its totient is φ = 312136070848.

The previous prime is 646586852137. The next prime is 646586852267. The reversal of 646586852266 is 662258685646.

It can be written as a sum of positive squares in 4 ways, for example, as 134081201241 + 512505651025 = 366171^2 + 715895^2 .

It is a junction number, because it is equal to n+sod(n) for n = 646586852198 and 646586852207.

It is not an unprimeable number, because it can be changed into a prime (646586852267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2048220 + ... + 2342728.

Almost surely, 2^646586852266 is an apocalyptic number.

646586852266 is a deficient number, since it is larger than the sum of its proper divisors (356767486334).

646586852266 is a wasteful number, since it uses less digits than its factorization.

646586852266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332393.

The product of its digits is 199065600, while the sum is 64.

The spelling of 646586852266 in words is "six hundred forty-six billion, five hundred eighty-six million, eight hundred fifty-two thousand, two hundred sixty-six".