668195632 has 80 divisors (see below), whose sum is σ = 1464281280. Its totient is φ = 293078016.

The previous prime is 668195621. The next prime is 668195653. The reversal of 668195632 is 236591866.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 942094 + ... + 942802.

It is an arithmetic number, because the mean of its divisors is an integer number (18303516).

Almost surely, 2^668195632 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 668195632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732140640).

668195632 is an abundant number, since it is smaller than the sum of its proper divisors (796085648).

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

668195632 is a wasteful number, since it uses less digits than its factorization.

668195632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950 (or 944 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 668195632 is about 25849.4803042537. The cubic root of 668195632 is about 874.2477919591.

The spelling of 668195632 in words is "six hundred sixty-eight million, one hundred ninety-five thousand, six hundred thirty-two".