68493393937 has 2 divisors, whose sum is σ = 68493393938. Its totient is φ = 68493393936.

The previous prime is 68493393803. The next prime is 68493393967. The reversal of 68493393937 is 73939339486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65441825856 + 3051568081 = 255816^2 + 55241^2 .

It is a cyclic number.

It is not a de Polignac number, because 68493393937 - 2²⁷ = 68359176209 is a prime.

It is not a weakly prime, because it can be changed into another prime (68493393967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34246696968 + 34246696969.

It is an arithmetic number, because the mean of its divisors is an integer number (34246696969).

Almost surely, 2^68493393937 is an apocalyptic number.

It is an amenable number.

68493393937 is a deficient number, since it is larger than the sum of its proper divisors (1).

68493393937 is an equidigital number, since it uses as much as digits as its factorization.

68493393937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79361856, while the sum is 64.

The spelling of 68493393937 in words is "sixty-eight billion, four hundred ninety-three million, three hundred ninety-three thousand, nine hundred thirty-seven".