646593646 has 4 divisors (see below), whose sum is σ = 969890472. Its totient is φ = 323296822.

The previous prime is 646593583. The next prime is 646593659. The reversal of 646593646 is 646395646.

It is a happy number.

646593646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 646593646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161648410 + ... + 161648413.

It is an arithmetic number, because the mean of its divisors is an integer number (242472618).

Almost surely, 2^646593646 is an apocalyptic number.

646593646 is a deficient number, since it is larger than the sum of its proper divisors (323296826).

646593646 is a wasteful number, since it uses less digits than its factorization.

646593646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323296825.

The product of its digits is 2799360, while the sum is 49.

The square root of 646593646 is about 25428.2057172739. The cubic root of 646593646 is about 864.7232660816.

The spelling of 646593646 in words is "six hundred forty-six million, five hundred ninety-three thousand, six hundred forty-six".