67604237161661 has 2 divisors, whose sum is σ = 67604237161662. Its totient is φ = 67604237161660.

The previous prime is 67604237161621. The next prime is 67604237161667. The reversal of 67604237161661 is 16616173240676.

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., 52994978455225 + 14609258706436 = 7279765^2 + 3822206^2 .

It is a cyclic number.

It is not a de Polignac number, because 67604237161661 - 2⁴² = 63206190650557 is a prime.

It is a super-2 number, since 2×67604237161661² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67604237161597 and 67604237161606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67604237161667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33802118580830 + 33802118580831.

It is an arithmetic number, because the mean of its divisors is an integer number (33802118580831).

Almost surely, 2^{67604237161661} is an apocalyptic number.

It is an amenable number.

67604237161661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67604237161661 is an equidigital number, since it uses as much as digits as its factorization.

67604237161661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 67604237161661 in words is "sixty-seven trillion, six hundred four billion, two hundred thirty-seven million, one hundred sixty-one thousand, six hundred sixty-one".