68656181 has 8 divisors (see below), whose sum is σ = 76724928. Its totient is φ = 60892000.

The previous prime is 68656153. The next prime is 68656187. The reversal of 68656181 is 18165686.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 68656181 - 2¹⁰ = 68655157 is a prime.

It is a super-2 number, since 2×68656181² = 9427342379009522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68656187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75665 + ... + 76566.

It is an arithmetic number, because the mean of its divisors is an integer number (9590616).

Almost surely, 2^68656181 is an apocalyptic number.

It is an amenable number.

68656181 is a deficient number, since it is larger than the sum of its proper divisors (8068747).

68656181 is a wasteful number, since it uses less digits than its factorization.

68656181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152283.

The product of its digits is 69120, while the sum is 41.

The square root of 68656181 is about 8285.9025458908. The cubic root of 68656181 is about 409.4742040410.

The spelling of 68656181 in words is "sixty-eight million, six hundred fifty-six thousand, one hundred eighty-one".