67011661 has 2 divisors, whose sum is σ = 67011662. Its totient is φ = 67011660.

The previous prime is 67011647. The next prime is 67011667. The reversal of 67011661 is 16611076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 15444900 = 7181^2 + 3930^2 .

It is a cyclic number.

It is not a de Polignac number, because 67011661 - 2⁵ = 67011629 is a prime.

It is equal to p_3952405 and since 67011661 and 3952405 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67011667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33505830 + 33505831.

It is an arithmetic number, because the mean of its divisors is an integer number (33505831).

Almost surely, 2^67011661 is an apocalyptic number.

It is an amenable number.

67011661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67011661 is an equidigital number, since it uses as much as digits as its factorization.

67011661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 67011661 is about 8186.0650498271. The cubic root of 67011661 is about 406.1783717187.

The spelling of 67011661 in words is "sixty-seven million, eleven thousand, six hundred sixty-one".