68007661 has 2 divisors, whose sum is σ = 68007662. Its totient is φ = 68007660.

The previous prime is 68007647. The next prime is 68007677. The reversal of 68007661 is 16670086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 10929636 = 7555^2 + 3306^2 .

It is a cyclic number.

It is not a de Polignac number, because 68007661 - 2⁵ = 68007629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68007601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34003830 + 34003831.

It is an arithmetic number, because the mean of its divisors is an integer number (34003831).

Almost surely, 2^68007661 is an apocalyptic number.

It is an amenable number.

68007661 is a deficient number, since it is larger than the sum of its proper divisors (1).

68007661 is an equidigital number, since it uses as much as digits as its factorization.

68007661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 68007661 is about 8246.6757545086. The cubic root of 68007661 is about 408.1808378317.

The spelling of 68007661 in words is "sixty-eight million, seven thousand, six hundred sixty-one".