668155344 has 40 divisors (see below), whose sum is σ = 1726993632. Its totient is φ = 222599040.

The previous prime is 668155339. The next prime is 668155351. The reversal of 668155344 is 443551866.

It is a junction number, because it is equal to n+sod(n) for n = 668155296 and 668155305.

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 7 ways as a sum of consecutive naturals, for example, 172954 + ... + 176774.

Almost surely, 2^668155344 is an apocalyptic number.

It is an amenable number.

668155344 is an abundant number, since it is smaller than the sum of its proper divisors (1058838288).

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

668155344 is a wasteful number, since it uses less digits than its factorization.

668155344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7475 (or 7469 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 668155344 is about 25848.7010118497. The cubic root of 668155344 is about 874.2302210556.

The spelling of 668155344 in words is "six hundred sixty-eight million, one hundred fifty-five thousand, three hundred forty-four".