67818481 has 2 divisors, whose sum is σ = 67818482. Its totient is φ = 67818480.

The previous prime is 67818473. The next prime is 67818493. The reversal of 67818481 is 18481876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50637456 + 17181025 = 7116^2 + 4145^2 .

It is a cyclic number.

It is not a de Polignac number, because 67818481 - 2³ = 67818473 is a prime.

It is a super-2 number, since 2×67818481² = 9198692730294722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67818431) 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 as a sum of consecutive naturals, namely, 33909240 + 33909241.

It is an arithmetic number, because the mean of its divisors is an integer number (33909241).

Almost surely, 2^67818481 is an apocalyptic number.

It is an amenable number.

67818481 is a deficient number, since it is larger than the sum of its proper divisors (1).

67818481 is an equidigital number, since it uses as much as digits as its factorization.

67818481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 43.

The square root of 67818481 is about 8235.1976904019. The cubic root of 67818481 is about 407.8020012789.

The spelling of 67818481 in words is "sixty-seven million, eight hundred eighteen thousand, four hundred eighty-one".