68720905439 has 2 divisors, whose sum is σ = 68720905440. Its totient is φ = 68720905438.

The previous prime is 68720905433. The next prime is 68720905489. The reversal of 68720905439 is 93450902786.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68720905439 - 2¹² = 68720901343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68720905433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34360452719 + 34360452720.

It is an arithmetic number, because the mean of its divisors is an integer number (34360452720).

Almost surely, 2^68720905439 is an apocalyptic number.

68720905439 is a deficient number, since it is larger than the sum of its proper divisors (1).

68720905439 is an equidigital number, since it uses as much as digits as its factorization.

68720905439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 68720905439 in words is "sixty-eight billion, seven hundred twenty million, nine hundred five thousand, four hundred thirty-nine".