68511742121 has 2 divisors, whose sum is σ = 68511742122. Its totient is φ = 68511742120.

The previous prime is 68511742069. The next prime is 68511742153. The reversal of 68511742121 is 12124711586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36305491600 + 32206250521 = 190540^2 + 179461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68511742121 is a prime.

It is a super-3 number, since 3×68511742121³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (68511142121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34255871060 + 34255871061.

It is an arithmetic number, because the mean of its divisors is an integer number (34255871061).

Almost surely, 2^68511742121 is an apocalyptic number.

It is an amenable number.

68511742121 is a deficient number, since it is larger than the sum of its proper divisors (1).

68511742121 is an equidigital number, since it uses as much as digits as its factorization.

68511742121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The spelling of 68511742121 in words is "sixty-eight billion, five hundred eleven million, seven hundred forty-two thousand, one hundred twenty-one".