67645997 has 2 divisors, whose sum is σ = 67645998. Its totient is φ = 67645996.

The previous prime is 67645987. The next prime is 67646017. The reversal of 67645997 is 79954676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66896041 + 749956 = 8179^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 67645997 - 2¹² = 67641901 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 (67645927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33822998 + 33822999.

It is an arithmetic number, because the mean of its divisors is an integer number (33822999).

Almost surely, 2^67645997 is an apocalyptic number.

It is an amenable number.

67645997 is a deficient number, since it is larger than the sum of its proper divisors (1).

67645997 is an equidigital number, since it uses as much as digits as its factorization.

67645997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 53.

The square root of 67645997 is about 8224.7186578022. The cubic root of 67645997 is about 407.4559843058.

The spelling of 67645997 in words is "sixty-seven million, six hundred forty-five thousand, nine hundred ninety-seven".