68423309249 has 2 divisors, whose sum is σ = 68423309250. Its totient is φ = 68423309248.

The previous prime is 68423309191. The next prime is 68423309261. The reversal of 68423309249 is 94290332486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66265056400 + 2158252849 = 257420^2 + 46457^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68423309249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68423309197 and 68423309206.

It is not a weakly prime, because it can be changed into another prime (68423300249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34211654624 + 34211654625.

It is an arithmetic number, because the mean of its divisors is an integer number (34211654625).

Almost surely, 2^68423309249 is an apocalyptic number.

It is an amenable number.

68423309249 is a deficient number, since it is larger than the sum of its proper divisors (1).

68423309249 is an equidigital number, since it uses as much as digits as its factorization.

68423309249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 50.

The spelling of 68423309249 in words is "sixty-eight billion, four hundred twenty-three million, three hundred nine thousand, two hundred forty-nine".