67645161 has 12 divisors (see below), whose sum is σ = 98076420. Its totient is φ = 44927520.

The previous prime is 67645141. The next prime is 67645183. The reversal of 67645161 is 16154676.

67645161 is a `hidden beast` number, since 6 + 7 + 645 + 1 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16451136 + 51194025 = 4056^2 + 7155^2 .

It is not a de Polignac number, because 67645161 - 2⁵ = 67645129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67645141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11550 + ... + 16391.

It is an arithmetic number, because the mean of its divisors is an integer number (8173035).

Almost surely, 2^67645161 is an apocalyptic number.

It is an amenable number.

67645161 is a deficient number, since it is larger than the sum of its proper divisors (30431259).

67645161 is a wasteful number, since it uses less digits than its factorization.

67645161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28216 (or 28213 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 67645161 is about 8224.6678352381. The cubic root of 67645161 is about 407.4543057901.

The spelling of 67645161 in words is "sixty-seven million, six hundred forty-five thousand, one hundred sixty-one".