68666653 has 6 divisors (see below), whose sum is σ = 75476702. Its totient is φ = 62424120.

The previous prime is 68666651. The next prime is 68666681. The reversal of 68666653 is 35666686.

It can be written as a sum of positive squares in only one way, i.e., 68608089 + 58564 = 8283^2 + 242^2 .

It is not a de Polignac number, because 68666653 - 2¹ = 68666651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68666651) 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 5 ways as a sum of consecutive naturals, for example, 283626 + ... + 283867.

Almost surely, 2^68666653 is an apocalyptic number.

It is an amenable number.

68666653 is a deficient number, since it is larger than the sum of its proper divisors (6810049).

68666653 is a wasteful number, since it uses less digits than its factorization.

68666653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567515 (or 567504 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The square root of 68666653 is about 8286.5344384731. The cubic root of 68666653 is about 409.4950217630.

The spelling of 68666653 in words is "sixty-eight million, six hundred sixty-six thousand, six hundred fifty-three".