68494281923 has 2 divisors, whose sum is σ = 68494281924. Its totient is φ = 68494281922.

The previous prime is 68494281913. The next prime is 68494282027. The reversal of 68494281923 is 32918249486.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68494281923 - 2¹² = 68494277827 is a prime.

It is a super-2 number, since 2×68494281923² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68494281913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34247140961 + 34247140962.

It is an arithmetic number, because the mean of its divisors is an integer number (34247140962).

Almost surely, 2^68494281923 is an apocalyptic number.

68494281923 is a deficient number, since it is larger than the sum of its proper divisors (1).

68494281923 is an equidigital number, since it uses as much as digits as its factorization.

68494281923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 56.

The spelling of 68494281923 in words is "sixty-eight billion, four hundred ninety-four million, two hundred eighty-one thousand, nine hundred twenty-three".