68147755513 has 2 divisors, whose sum is σ = 68147755514. Its totient is φ = 68147755512.

The previous prime is 68147755499. The next prime is 68147755523. The reversal of 68147755513 is 31555774186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53177743609 + 14970011904 = 230603^2 + 122352^2 .

It is a cyclic number.

It is not a de Polignac number, because 68147755513 - 2³³ = 59557820921 is a prime.

It is not a weakly prime, because it can be changed into another prime (68147755523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34073877756 + 34073877757.

It is an arithmetic number, because the mean of its divisors is an integer number (34073877757).

Almost surely, 2^68147755513 is an apocalyptic number.

It is an amenable number.

68147755513 is a deficient number, since it is larger than the sum of its proper divisors (1).

68147755513 is an equidigital number, since it uses as much as digits as its factorization.

68147755513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528000, while the sum is 52.

The spelling of 68147755513 in words is "sixty-eight billion, one hundred forty-seven million, seven hundred fifty-five thousand, five hundred thirteen".