67161861 has 12 divisors (see below), whose sum is σ = 104474188. Its totient is φ = 41330304.

The previous prime is 67161851. The next prime is 67161893. The reversal of 67161861 is 16816176.

It can be written as a sum of positive squares in 2 ways, for example, as 15752961 + 51408900 = 3969^2 + 7170^2 .

It is not a de Polignac number, because 67161861 - 2¹⁰ = 67160837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67161851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286900 + ... + 287133.

Almost surely, 2^67161861 is an apocalyptic number.

It is an amenable number.

67161861 is a deficient number, since it is larger than the sum of its proper divisors (37312327).

67161861 is a wasteful number, since it uses less digits than its factorization.

67161861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574052 (or 574049 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 67161861 is about 8195.2340418075. The cubic root of 67161861 is about 406.4816147964.

The spelling of 67161861 in words is "sixty-seven million, one hundred sixty-one thousand, eight hundred sixty-one".