668459163264 has 128 divisors (see below), whose sum is σ = 1826641279680. Its totient is φ = 216434073600.

The previous prime is 668459163259. The next prime is 668459163287. The reversal of 668459163264 is 462361954866.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 668459163198 and 668459163207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8499867 + ... + 8578149.

Almost surely, 2^668459163264 is an apocalyptic number.

668459163264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668459163264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913320639840).

668459163264 is an abundant number, since it is smaller than the sum of its proper divisors (1158182116416).

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

668459163264 is a wasteful number, since it uses less digits than its factorization.

668459163264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78938 (or 78926 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 60.

The spelling of 668459163264 in words is "six hundred sixty-eight billion, four hundred fifty-nine million, one hundred sixty-three thousand, two hundred sixty-four".