646464261160 has 128 divisors (see below), whose sum is σ = 1556156448000. Its totient is φ = 240851349504.

The previous prime is 646464261137. The next prime is 646464261187. The reversal of 646464261160 is 61162464646.

It is a self number, because there is not a number n which added to its sum of digits gives 646464261160.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25992811 + ... + 26017669.

It is an arithmetic number, because the mean of its divisors is an integer number (12157472250).

Almost surely, 2^646464261160 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646464261160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778078224000).

646464261160 is an abundant number, since it is smaller than the sum of its proper divisors (909692186840).

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

646464261160 is a wasteful number, since it uses less digits than its factorization.

646464261160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25283 (or 25279 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 46.

The spelling of 646464261160 in words is "six hundred forty-six billion, four hundred sixty-four million, two hundred sixty-one thousand, one hundred sixty".