68166513 has 12 divisors (see below), whose sum is σ = 98563140. Its totient is φ = 45398016.

The previous prime is 68166499. The next prime is 68166517. The reversal of 68166513 is 31566186.

It is a happy number.

68166513 is a `hidden beast` number, since 6 + 81 + 66 + 513 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 57881664 + 10284849 = 7608^2 + 3207^2 .

It is not a de Polignac number, because 68166513 - 2¹² = 68162417 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68166517) 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, 7093 + ... + 13661.

It is an arithmetic number, because the mean of its divisors is an integer number (8213595).

Almost surely, 2^68166513 is an apocalyptic number.

It is an amenable number.

68166513 is a deficient number, since it is larger than the sum of its proper divisors (30396627).

68166513 is a wasteful number, since it uses less digits than its factorization.

68166513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7728 (or 7725 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 68166513 is about 8256.3014116492. The cubic root of 68166513 is about 408.4983997177.

The spelling of 68166513 in words is "sixty-eight million, one hundred sixty-six thousand, five hundred thirteen".