68180981 has 8 divisors (see below), whose sum is σ = 75599328. Its totient is φ = 60966000.

The previous prime is 68180969. The next prime is 68181007. The reversal of 68180981 is 18908186.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68180981 is a prime.

It is a super-2 number, since 2×68180981² = 9297292340244722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68180951) 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, 50135 + ... + 51476.

It is an arithmetic number, because the mean of its divisors is an integer number (9449916).

Almost surely, 2^68180981 is an apocalyptic number.

68180981 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

68180981 is a deficient number, since it is larger than the sum of its proper divisors (7418347).

68180981 is a wasteful number, since it uses less digits than its factorization.

68180981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101683.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 68180981 is about 8257.1775444155. The cubic root of 68180981 is about 408.5272982511.

The spelling of 68180981 in words is "sixty-eight million, one hundred eighty thousand, nine hundred eighty-one".