68156818 has 4 divisors (see below), whose sum is σ = 102235230. Its totient is φ = 34078408.

The previous prime is 68156813. The next prime is 68156821. The reversal of 68156818 is 81865186.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 6487209 = 7853^2 + 2547^2 .

It is not an unprimeable number, because it can be changed into a prime (68156813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17039203 + ... + 17039206.

Almost surely, 2^68156818 is an apocalyptic number.

68156818 is a deficient number, since it is larger than the sum of its proper divisors (34078412).

68156818 is a wasteful number, since it uses less digits than its factorization.

68156818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34078411.

The product of its digits is 92160, while the sum is 43.

The square root of 68156818 is about 8255.7142634662. The cubic root of 68156818 is about 408.4790325358.

The spelling of 68156818 in words is "sixty-eight million, one hundred fifty-six thousand, eight hundred eighteen".