646575686905 has 32 divisors (see below), whose sum is σ = 817977323520. Its totient is φ = 489994375680.

The previous prime is 646575686899. The next prime is 646575686921. The reversal of 646575686905 is 509686575646.

It is a de Polignac number, because none of the positive numbers 2^k-646575686905 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3606376 + ... + 3781414.

It is an arithmetic number, because the mean of its divisors is an integer number (25561791360).

Almost surely, 2^646575686905 is an apocalyptic number.

It is an amenable number.

646575686905 is a deficient number, since it is larger than the sum of its proper divisors (171401636615).

646575686905 is a wasteful number, since it uses less digits than its factorization.

646575686905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175609.

The product of its (nonzero) digits is 326592000, while the sum is 67.

The spelling of 646575686905 in words is "six hundred forty-six billion, five hundred seventy-five million, six hundred eighty-six thousand, nine hundred five".