67439135761 has 2 divisors, whose sum is σ = 67439135762. Its totient is φ = 67439135760.

The previous prime is 67439135749. The next prime is 67439135833. The reversal of 67439135761 is 16753193476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67239083025 + 200052736 = 259305^2 + 14144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67439135761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67439135699 and 67439135708.

It is not a weakly prime, because it can be changed into another prime (67439135461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33719567880 + 33719567881.

It is an arithmetic number, because the mean of its divisors is an integer number (33719567881).

Almost surely, 2^67439135761 is an apocalyptic number.

It is an amenable number.

67439135761 is a deficient number, since it is larger than the sum of its proper divisors (1).

67439135761 is an equidigital number, since it uses as much as digits as its factorization.

67439135761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 52.

The spelling of 67439135761 in words is "sixty-seven billion, four hundred thirty-nine million, one hundred thirty-five thousand, seven hundred sixty-one".