668687020176 has 160 divisors (see below), whose sum is σ = 2035803414528. Its totient is φ = 185172595200.

The previous prime is 668687020159. The next prime is 668687020181. The reversal of 668687020176 is 671020786866.

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 31 ways as a sum of consecutive naturals, for example, 1421026 + ... + 1832126.

Almost surely, 2^668687020176 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 668687020176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017901707264).

668687020176 is an abundant number, since it is smaller than the sum of its proper divisors (1367116394352).

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

668687020176 is a wasteful number, since it uses less digits than its factorization.

668687020176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411269 (or 411263 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 668687020176 in words is "six hundred sixty-eight billion, six hundred eighty-seven million, twenty thousand, one hundred seventy-six".