646510785328 has 20 divisors (see below), whose sum is σ = 1279266023520. Its totient is φ = 316377617984.

The previous prime is 646510785269. The next prime is 646510785367. The reversal of 646510785328 is 823587015646.

It is a happy 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, 429860143 + ... + 429861646.

It is an arithmetic number, because the mean of its divisors is an integer number (63963301176).

Almost surely, 2^646510785328 is an apocalyptic number.

It is an amenable number.

646510785328 is a deficient number, since it is larger than the sum of its proper divisors (632755238192).

646510785328 is a wasteful number, since it uses less digits than its factorization.

646510785328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859721844 (or 859721838 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 646510785328 in words is "six hundred forty-six billion, five hundred ten million, seven hundred eighty-five thousand, three hundred twenty-eight".