81068653 has 2 divisors, whose sum is σ = 81068654. Its totient is φ = 81068652.

The previous prime is 81068651. The next prime is 81068683. The reversal of 81068653 is 35686018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69255684 + 11812969 = 8322^2 + 3437^2 .

It is a cyclic number.

It is not a de Polignac number, because 81068653 - 2¹ = 81068651 is a prime.

Together with 81068651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81068651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40534326 + 40534327.

It is an arithmetic number, because the mean of its divisors is an integer number (40534327).

Almost surely, 2^81068653 is an apocalyptic number.

It is an amenable number.

81068653 is a deficient number, since it is larger than the sum of its proper divisors (1).

81068653 is an equidigital number, since it uses as much as digits as its factorization.

81068653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 81068653 is about 9003.8132477301. The cubic root of 81068653 is about 432.7970770169.

The spelling of 81068653 in words is "eighty-one million, sixty-eight thousand, six hundred fifty-three".