68159656 has 8 divisors (see below), whose sum is σ = 127799370. Its totient is φ = 34079824.

The previous prime is 68159639. The next prime is 68159659. The reversal of 68159656 is 65695186.

It can be written as a sum of positive squares in only one way, i.e., 38019556 + 30140100 = 6166^2 + 5490^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (68159659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4259971 + ... + 4259986.

Almost surely, 2^68159656 is an apocalyptic number.

It is an amenable number.

68159656 is a deficient number, since it is larger than the sum of its proper divisors (59639714).

68159656 is a wasteful number, since it uses less digits than its factorization.

68159656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8519963 (or 8519959 counting only the distinct ones).

The product of its digits is 388800, while the sum is 46.

The square root of 68159656 is about 8255.8861426258. The cubic root of 68159656 is about 408.4847020464.

It can be divided in two parts, 6815 and 9656, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 68159656 in words is "sixty-eight million, one hundred fifty-nine thousand, six hundred fifty-six".