68166656 has 22 divisors (see below), whose sum is σ = 136268790. Its totient is φ = 34082816.

The previous prime is 68166649. The next prime is 68166667. The reversal of 68166656 is 65666186.

It can be written as a sum of positive squares in only one way, i.e., 40960000 + 27206656 = 6400^2 + 5216^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32261 + ... + 34308.

Almost surely, 2^68166656 is an apocalyptic number.

It is an amenable number.

68166656 is a deficient number, since it is larger than the sum of its proper divisors (68102134).

68166656 is an equidigital number, since it uses as much as digits as its factorization.

68166656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66589 (or 66571 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 68166656 is about 8256.3100716967. The cubic root of 68166656 is about 408.4986853674.

The spelling of 68166656 in words is "sixty-eight million, one hundred sixty-six thousand, six hundred fifty-six".