646186868674 has 16 divisors (see below), whose sum is σ = 973539367416. Its totient is φ = 321674400000.

The previous prime is 646186868647. The next prime is 646186868687. The reversal of 646186868674 is 476868681646.

It can be written as a sum of positive squares in 4 ways, for example, as 496721896225 + 149464972449 = 704785^2 + 386607^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842424 + ... + 2164924.

Almost surely, 2^646186868674 is an apocalyptic number.

646186868674 is a deficient number, since it is larger than the sum of its proper divisors (327352498742).

646186868674 is a wasteful number, since it uses less digits than its factorization.

646186868674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326901.

The product of its digits is 445906944, while the sum is 70.

The spelling of 646186868674 in words is "six hundred forty-six billion, one hundred eighty-six million, eight hundred sixty-eight thousand, six hundred seventy-four".