668746056 has 64 divisors (see below), whose sum is σ = 1826334720. Its totient is φ = 202374720.

The previous prime is 668746049. The next prime is 668746063. The reversal of 668746056 is 650647866.

It is an interprime number because it is at equal distance from previous prime (668746049) and next prime (668746063).

It is a junction number, because it is equal to n+sod(n) for n = 668745996 and 668746014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279441 + ... + 281823.

It is an arithmetic number, because the mean of its divisors is an integer number (28536480).

Almost surely, 2^668746056 is an apocalyptic number.

668746056 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

668746056 is an abundant number, since it is smaller than the sum of its proper divisors (1157588664).

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

668746056 is a wasteful number, since it uses less digits than its factorization.

668746056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466 (or 3462 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The square root of 668746056 is about 25860.1248256848. The cubic root of 668746056 is about 874.4877790094.

The spelling of 668746056 in words is "six hundred sixty-eight million, seven hundred forty-six thousand, fifty-six".