68663081 has 4 divisors (see below), whose sum is σ = 69157200. Its totient is φ = 68168964.

The previous prime is 68663059. The next prime is 68663113. The reversal of 68663081 is 18036686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68663081 is a prime.

It is a super-2 number, since 2×68663081² = 9429237384825122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68663011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246851 + ... + 247128.

It is an arithmetic number, because the mean of its divisors is an integer number (17289300).

Almost surely, 2^68663081 is an apocalyptic number.

It is an amenable number.

68663081 is a deficient number, since it is larger than the sum of its proper divisors (494119).

68663081 is a wasteful number, since it uses less digits than its factorization.

68663081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494118.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 68663081 is about 8286.3189052800. The cubic root of 68663081 is about 409.4879210742.

The spelling of 68663081 in words is "sixty-eight million, six hundred sixty-three thousand, eighty-one".