68427640493 has 4 divisors (see below), whose sum is σ = 70277036220. Its totient is φ = 66578244768.

The previous prime is 68427640427. The next prime is 68427640499. The reversal of 68427640493 is 39404672486.

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 28819476169 + 39608164324 = 169763^2 + 199018^2 .

It is a cyclic number.

It is not a de Polignac number, because 68427640493 - 2³⁰ = 67353898669 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 (68427640499) 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, 924697808 + ... + 924697881.

It is an arithmetic number, because the mean of its divisors is an integer number (17569259055).

Almost surely, 2^68427640493 is an apocalyptic number.

It is an amenable number.

68427640493 is a deficient number, since it is larger than the sum of its proper divisors (1849395727).

68427640493 is a wasteful number, since it uses less digits than its factorization.

68427640493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849395726.

The product of its (nonzero) digits is 6967296, while the sum is 53.

The spelling of 68427640493 in words is "sixty-eight billion, four hundred twenty-seven million, six hundred forty thousand, four hundred ninety-three".