68665582493 has 4 divisors (see below), whose sum is σ = 68671570620. Its totient is φ = 68659594368.

The previous prime is 68665582471. The next prime is 68665582501. The reversal of 68665582493 is 39428556686.

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 21820607524 + 46844974969 = 147718^2 + 216437^2 .

It is a cyclic number.

It is not a de Polignac number, because 68665582493 - 2²² = 68661388189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68665582393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2976830 + ... + 2999807.

It is an arithmetic number, because the mean of its divisors is an integer number (17167892655).

Almost surely, 2^68665582493 is an apocalyptic number.

It is an amenable number.

68665582493 is a deficient number, since it is larger than the sum of its proper divisors (5988127).

68665582493 is a wasteful number, since it uses less digits than its factorization.

68665582493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5988126.

The product of its digits is 74649600, while the sum is 62.

The spelling of 68665582493 in words is "sixty-eight billion, six hundred sixty-five million, five hundred eighty-two thousand, four hundred ninety-three".