67658057449 has 2 divisors, whose sum is σ = 67658057450. Its totient is φ = 67658057448.

The previous prime is 67658057431. The next prime is 67658057491. The reversal of 67658057449 is 94475085676.

It is a happy number.

67658057449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61722433600 + 5935623849 = 248440^2 + 77043^2 .

It is a cyclic number.

It is not a de Polignac number, because 67658057449 - 2⁵ = 67658057417 is a prime.

It is a super-2 number, since 2×67658057449² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67658057549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33829028724 + 33829028725.

It is an arithmetic number, because the mean of its divisors is an integer number (33829028725).

Almost surely, 2^67658057449 is an apocalyptic number.

It is an amenable number.

67658057449 is a deficient number, since it is larger than the sum of its proper divisors (1).

67658057449 is an equidigital number, since it uses as much as digits as its factorization.

67658057449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50803200, while the sum is 61.

The spelling of 67658057449 in words is "sixty-seven billion, six hundred fifty-eight million, fifty-seven thousand, four hundred forty-nine".