646348816 has 20 divisors (see below), whose sum is σ = 1258600000. Its totient is φ = 321548832.

The previous prime is 646348763. The next prime is 646348831. The reversal of 646348816 is 618843646.

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, 98316 + ... + 104683.

It is an arithmetic number, because the mean of its divisors is an integer number (62930000).

Almost surely, 2^646348816 is an apocalyptic number.

It is an amenable number.

646348816 is a deficient number, since it is larger than the sum of its proper divisors (612251184).

646348816 is a wasteful number, since it uses less digits than its factorization.

646348816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203206 (or 203200 counting only the distinct ones).

The product of its digits is 663552, while the sum is 46.

The square root of 646348816 is about 25423.3911192036. The cubic root of 646348816 is about 864.6141110117.

The spelling of 646348816 in words is "six hundred forty-six million, three hundred forty-eight thousand, eight hundred sixteen".