67720043497 has 2 divisors, whose sum is σ = 67720043498. Its totient is φ = 67720043496.

The previous prime is 67720043453. The next prime is 67720043543. The reversal of 67720043497 is 79434002776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56786413401 + 10933630096 = 238299^2 + 104564^2 .

It is a cyclic number.

It is not a de Polignac number, because 67720043497 - 2¹¹ = 67720041449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67720043497.

It is not a weakly prime, because it can be changed into another prime (67720040497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860021748 + 33860021749.

It is an arithmetic number, because the mean of its divisors is an integer number (33860021749).

Almost surely, 2^67720043497 is an apocalyptic number.

It is an amenable number.

67720043497 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720043497 is an equidigital number, since it uses as much as digits as its factorization.

67720043497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 49.

The spelling of 67720043497 in words is "sixty-seven billion, seven hundred twenty million, forty-three thousand, four hundred ninety-seven".