668351574 has 128 divisors (see below), whose sum is σ = 1700352000. Its totient is φ = 195138720.

The previous prime is 668351539. The next prime is 668351591. The reversal of 668351574 is 475153866.

668351574 is a `hidden beast` number, since 6 + 68 + 3 + 515 + 74 = 666.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 1395067 + ... + 1395545.

It is an arithmetic number, because the mean of its divisors is an integer number (13284000).

Almost surely, 2^668351574 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668351574, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850176000).

668351574 is an abundant number, since it is smaller than the sum of its proper divisors (1032000426).

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

668351574 is a wasteful number, since it uses less digits than its factorization.

668351574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 524 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 668351574 is about 25852.4964751956. The cubic root of 668351574 is about 874.3157966663.

The spelling of 668351574 in words is "six hundred sixty-eight million, three hundred fifty-one thousand, five hundred seventy-four".