68623661 has 2 divisors, whose sum is σ = 68623662. Its totient is φ = 68623660.

The previous prime is 68623637. The next prime is 68623693. The reversal of 68623661 is 16632686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 17056900 = 7181^2 + 4130^2 .

It is a cyclic number.

It is not a de Polignac number, because 68623661 - 2¹⁰ = 68622637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68628661) 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, 34311830 + 34311831.

It is an arithmetic number, because the mean of its divisors is an integer number (34311831).

Almost surely, 2^68623661 is an apocalyptic number.

It is an amenable number.

68623661 is a deficient number, since it is larger than the sum of its proper divisors (1).

68623661 is an equidigital number, since it uses as much as digits as its factorization.

68623661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 68623661 is about 8283.9399442536. The cubic root of 68623661 is about 409.4095426906.

The spelling of 68623661 in words is "sixty-eight million, six hundred twenty-three thousand, six hundred sixty-one".