68423309261 has 2 divisors, whose sum is σ = 68423309262. Its totient is φ = 68423309260.

The previous prime is 68423309249. The next prime is 68423309263. The reversal of 68423309261 is 16290332486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68303822500 + 119486761 = 261350^2 + 10931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68423309261 is a prime.

It is a super-2 number, since 2×68423309261² (a number of 22 digits) contains 22 as substring.

Together with 68423309263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68423309263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34211654630 + 34211654631.

It is an arithmetic number, because the mean of its divisors is an integer number (34211654631).

Almost surely, 2^68423309261 is an apocalyptic number.

It is an amenable number.

68423309261 is a deficient number, since it is larger than the sum of its proper divisors (1).

68423309261 is an equidigital number, since it uses as much as digits as its factorization.

68423309261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 68423309261 in words is "sixty-eight billion, four hundred twenty-three million, three hundred nine thousand, two hundred sixty-one".