646578238056 has 16 divisors (see below), whose sum is σ = 1616445595200. Its totient is φ = 215526079344.

The previous prime is 646578238049. The next prime is 646578238063. The reversal of 646578238056 is 650832875646.

It is an interprime number because it is at equal distance from previous prime (646578238049) and next prime (646578238063).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13470379936 + ... + 13470379983.

It is an arithmetic number, because the mean of its divisors is an integer number (101027849700).

Almost surely, 2^646578238056 is an apocalyptic number.

It is an amenable number.

646578238056 is an abundant number, since it is smaller than the sum of its proper divisors (969867357144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646578238056 is a wasteful number, since it uses less digits than its factorization.

646578238056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26940759928 (or 26940759924 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 60.

The spelling of 646578238056 in words is "six hundred forty-six billion, five hundred seventy-eight million, two hundred thirty-eight thousand, fifty-six".