67142028749 has 2 divisors, whose sum is σ = 67142028750. Its totient is φ = 67142028748.

The previous prime is 67142028731. The next prime is 67142028761. The reversal of 67142028749 is 94782024176.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45675383524 + 21466645225 = 213718^2 + 146515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67142028749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67142028697 and 67142028706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67142028049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33571014374 + 33571014375.

It is an arithmetic number, because the mean of its divisors is an integer number (33571014375).

Almost surely, 2^67142028749 is an apocalyptic number.

It is an amenable number.

67142028749 is a deficient number, since it is larger than the sum of its proper divisors (1).

67142028749 is an equidigital number, since it uses as much as digits as its factorization.

67142028749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 67142028749 in words is "sixty-seven billion, one hundred forty-two million, twenty-eight thousand, seven hundred forty-nine".