67968161 has 4 divisors (see below), whose sum is σ = 68122032. Its totient is φ = 67814292.

The previous prime is 67968139. The next prime is 67968163. The reversal of 67968161 is 16186976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67968161 - 2²⁶ = 859297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67968163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76271 + ... + 77156.

It is an arithmetic number, because the mean of its divisors is an integer number (17030508).

Almost surely, 2^67968161 is an apocalyptic number.

It is an amenable number.

67968161 is a deficient number, since it is larger than the sum of its proper divisors (153871).

67968161 is a wasteful number, since it uses less digits than its factorization.

67968161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153870.

The product of its digits is 108864, while the sum is 44.

The square root of 67968161 is about 8244.2805022634. The cubic root of 67968161 is about 408.1017964149.

The spelling of 67968161 in words is "sixty-seven million, nine hundred sixty-eight thousand, one hundred sixty-one".