68947013081 has 2 divisors, whose sum is σ = 68947013082. Its totient is φ = 68947013080.

The previous prime is 68947013039. The next prime is 68947013089. The reversal of 68947013081 is 18031074986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68482179481 + 464833600 = 261691^2 + 21560^2 .

It is a cyclic number.

It is not a de Polignac number, because 68947013081 - 2¹⁴ = 68946996697 is a prime.

It is a super-2 number, since 2×68947013081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68947013089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34473506540 + 34473506541.

It is an arithmetic number, because the mean of its divisors is an integer number (34473506541).

Almost surely, 2^68947013081 is an apocalyptic number.

It is an amenable number.

68947013081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68947013081 is an equidigital number, since it uses as much as digits as its factorization.

68947013081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 68947013081 in words is "sixty-eight billion, nine hundred forty-seven million, thirteen thousand, eighty-one".