646500001960 has 64 divisors (see below), whose sum is σ = 1546801822800. Its totient is φ = 242343591936.

The previous prime is 646500001949. The next prime is 646500002021. The reversal of 646500001960 is 69100005646.

It can be written as a sum of positive squares in 8 ways, for example, as 510558837156 + 135941164804 = 714534^2 + 368702^2 .

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 15 ways as a sum of consecutive naturals, for example, 1881765 + ... + 2198644.

Almost surely, 2^646500001960 is an apocalyptic number.

It is an amenable number.

646500001960 is an abundant number, since it is smaller than the sum of its proper divisors (900301820840).

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

646500001960 is a wasteful number, since it uses less digits than its factorization.

646500001960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080670 (or 4080666 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 646500001960 in words is "six hundred forty-six billion, five hundred million, one thousand, nine hundred sixty".