68655833509 has 2 divisors, whose sum is σ = 68655833510. Its totient is φ = 68655833508.

The previous prime is 68655833501. The next prime is 68655833549. The reversal of 68655833509 is 90533855686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52969022500 + 15686811009 = 230150^2 + 125247^2 .

It is a cyclic number.

It is not a de Polignac number, because 68655833509 - 2³ = 68655833501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68655833501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34327916754 + 34327916755.

It is an arithmetic number, because the mean of its divisors is an integer number (34327916755).

Almost surely, 2^68655833509 is an apocalyptic number.

It is an amenable number.

68655833509 is a deficient number, since it is larger than the sum of its proper divisors (1).

68655833509 is an equidigital number, since it uses as much as digits as its factorization.

68655833509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328000, while the sum is 58.

The spelling of 68655833509 in words is "sixty-eight billion, six hundred fifty-five million, eight hundred thirty-three thousand, five hundred nine".