68663753 has 4 divisors (see below), whose sum is σ = 68686740. Its totient is φ = 68640768.

The previous prime is 68663747. The next prime is 68663761. The reversal of 68663753 is 35736686.

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 29626249 + 39037504 = 5443^2 + 6248^2 .

It is a cyclic number.

It is not a de Polignac number, because 68663753 - 2⁴ = 68663737 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 (68663723) 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, 6200 + ... + 13257.

It is an arithmetic number, because the mean of its divisors is an integer number (17171685).

Almost surely, 2^68663753 is an apocalyptic number.

It is an amenable number.

68663753 is a deficient number, since it is larger than the sum of its proper divisors (22987).

68663753 is a wasteful number, since it uses less digits than its factorization.

68663753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22986.

The product of its digits is 544320, while the sum is 44.

The square root of 68663753 is about 8286.3594539460. The cubic root of 68663753 is about 409.4892569449.

The spelling of 68663753 in words is "sixty-eight million, six hundred sixty-three thousand, seven hundred fifty-three".