68118681 has 8 divisors (see below), whose sum is σ = 91919520. Its totient is φ = 44865152.

The previous prime is 68118679. The next prime is 68118683. The reversal of 68118681 is 18681186.

It is an interprime number because it is at equal distance from previous prime (68118679) and next prime (68118683).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68118681 - 2¹ = 68118679 is a prime.

It is a super-2 number, since 2×68118681² = 9280309402359522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68118683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136536 + ... + 137033.

It is an arithmetic number, because the mean of its divisors is an integer number (11489940).

Almost surely, 2^68118681 is an apocalyptic number.

It is an amenable number.

68118681 is a deficient number, since it is larger than the sum of its proper divisors (23800839).

68118681 is a wasteful number, since it uses less digits than its factorization.

68118681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273655.

The product of its digits is 18432, while the sum is 39.

The square root of 68118681 is about 8253.4042067501. The cubic root of 68118681 is about 408.4028304683.

The spelling of 68118681 in words is "sixty-eight million, one hundred eighteen thousand, six hundred eighty-one".