646667168340 has 48 divisors (see below), whose sum is σ = 1811753233920. Its totient is φ = 172341229440.

The previous prime is 646667168291. The next prime is 646667168387. The reversal of 646667168340 is 43861766646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3128676 + ... + 3328955.

It is an arithmetic number, because the mean of its divisors is an integer number (37744859040).

Almost surely, 2^646667168340 is an apocalyptic number.

646667168340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646667168340 is an abundant number, since it is smaller than the sum of its proper divisors (1165086065580).

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

646667168340 is a wasteful number, since it uses less digits than its factorization.

646667168340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6459312 (or 6459310 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 57.

The spelling of 646667168340 in words is "six hundred forty-six billion, six hundred sixty-seven million, one hundred sixty-eight thousand, three hundred forty".