67107611156561 has 2 divisors, whose sum is σ = 67107611156562. Its totient is φ = 67107611156560.

The previous prime is 67107611156461. The next prime is 67107611156617. The reversal of 67107611156561 is 16565111670176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49467871555600 + 17639739600961 = 7033340^2 + 4199969^2 .

It is a cyclic number.

It is not a de Polignac number, because 67107611156561 - 2³⁰ = 67106537414737 is a prime.

It is not a weakly prime, because it can be changed into another prime (67107611156461) 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, 33553805578280 + 33553805578281.

It is an arithmetic number, because the mean of its divisors is an integer number (33553805578281).

Almost surely, 2^{67107611156561} is an apocalyptic number.

It is an amenable number.

67107611156561 is a deficient number, since it is larger than the sum of its proper divisors (1).

67107611156561 is an equidigital number, since it uses as much as digits as its factorization.

67107611156561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 67107611156561 in words is "sixty-seven trillion, one hundred seven billion, six hundred eleven million, one hundred fifty-six thousand, five hundred sixty-one".