646548668 has 12 divisors (see below), whose sum is σ = 1150637880. Its totient is φ = 317794992.

The previous prime is 646548659. The next prime is 646548689. The reversal of 646548668 is 866845646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369571 + ... + 1370042.

It is an arithmetic number, because the mean of its divisors is an integer number (95886490).

Almost surely, 2^646548668 is an apocalyptic number.

It is an amenable number.

646548668 is a deficient number, since it is larger than the sum of its proper divisors (504089212).

646548668 is a wasteful number, since it uses less digits than its factorization.

646548668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739676 (or 2739674 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 53.

The square root of 646548668 is about 25427.3212902972. The cubic root of 646548668 is about 864.7032151449.

The spelling of 646548668 in words is "six hundred forty-six million, five hundred forty-eight thousand, six hundred sixty-eight".