67717649 has 2 divisors, whose sum is σ = 67717650. Its totient is φ = 67717648.

The previous prime is 67717631. The next prime is 67717651. The reversal of 67717649 is 94671776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58675600 + 9042049 = 7660^2 + 3007^2 .

It is a cyclic number.

It is not a de Polignac number, because 67717649 - 2⁸ = 67717393 is a prime.

Together with 67717651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67717619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33858824 + 33858825.

It is an arithmetic number, because the mean of its divisors is an integer number (33858825).

Almost surely, 2^67717649 is an apocalyptic number.

It is an amenable number.

67717649 is a deficient number, since it is larger than the sum of its proper divisors (1).

67717649 is an equidigital number, since it uses as much as digits as its factorization.

67717649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 47.

The square root of 67717649 is about 8229.0733986276. The cubic root of 67717649 is about 407.5997953986.

The spelling of 67717649 in words is "sixty-seven million, seven hundred seventeen thousand, six hundred forty-nine".