67016265581 has 2 divisors, whose sum is σ = 67016265582. Its totient is φ = 67016265580.

The previous prime is 67016265521. The next prime is 67016265653. The reversal of 67016265581 is 18556261076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46930289956 + 20085975625 = 216634^2 + 141725^2 .

It is a cyclic number.

It is not a de Polignac number, because 67016265581 - 2¹⁴ = 67016249197 is a prime.

It is a super-2 number, since 2×67016265581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67016265521) 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, 33508132790 + 33508132791.

It is an arithmetic number, because the mean of its divisors is an integer number (33508132791).

Almost surely, 2^67016265581 is an apocalyptic number.

It is an amenable number.

67016265581 is a deficient number, since it is larger than the sum of its proper divisors (1).

67016265581 is an equidigital number, since it uses as much as digits as its factorization.

67016265581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 67016265581 in words is "sixty-seven billion, sixteen million, two hundred sixty-five thousand, five hundred eighty-one".