67571878949 has 2 divisors, whose sum is σ = 67571878950. Its totient is φ = 67571878948.

The previous prime is 67571878873. The next prime is 67571878967. The reversal of 67571878949 is 94987817576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55404685924 + 12167193025 = 235382^2 + 110305^2 .

It is a cyclic number.

It is not a de Polignac number, because 67571878949 - 2²⁰ = 67570830373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67571878999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33785939474 + 33785939475.

It is an arithmetic number, because the mean of its divisors is an integer number (33785939475).

Almost surely, 2^67571878949 is an apocalyptic number.

It is an amenable number.

67571878949 is a deficient number, since it is larger than the sum of its proper divisors (1).

67571878949 is an equidigital number, since it uses as much as digits as its factorization.

67571878949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 213373440, while the sum is 71.

The spelling of 67571878949 in words is "sixty-seven billion, five hundred seventy-one million, eight hundred seventy-eight thousand, nine hundred forty-nine".