68660161 has 4 divisors (see below), whose sum is σ = 72699012. Its totient is φ = 64621312.

The previous prime is 68660149. The next prime is 68660191. The reversal of 68660161 is 16106686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55591936 + 13068225 = 7456^2 + 3615^2 .

It is a cyclic number.

It is not a de Polignac number, because 68660161 - 2¹³ = 68651969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68660101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019400 + ... + 2019433.

It is an arithmetic number, because the mean of its divisors is an integer number (18174753).

Almost surely, 2^68660161 is an apocalyptic number.

It is an amenable number.

68660161 is a deficient number, since it is larger than the sum of its proper divisors (4038851).

68660161 is a wasteful number, since it uses less digits than its factorization.

68660161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038850.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 68660161 is about 8286.1427093672. The cubic root of 68660161 is about 409.4821162970.

The spelling of 68660161 in words is "sixty-eight million, six hundred sixty thousand, one hundred sixty-one".