68081517503 has 2 divisors, whose sum is σ = 68081517504. Its totient is φ = 68081517502.

The previous prime is 68081517479. The next prime is 68081517583. The reversal of 68081517503 is 30571518086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68081517503 - 2²² = 68077323199 is a prime.

It is a super-2 number, since 2×68081517503² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68081517583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34040758751 + 34040758752.

It is an arithmetic number, because the mean of its divisors is an integer number (34040758752).

Almost surely, 2^68081517503 is an apocalyptic number.

68081517503 is a deficient number, since it is larger than the sum of its proper divisors (1).

68081517503 is an equidigital number, since it uses as much as digits as its factorization.

68081517503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 68081517503 in words is "sixty-eight billion, eighty-one million, five hundred seventeen thousand, five hundred three".