68990507243639 has 2 divisors, whose sum is σ = 68990507243640. Its totient is φ = 68990507243638.

The previous prime is 68990507243611. The next prime is 68990507243659. The reversal of 68990507243639 is 93634270509986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68990507243639 - 2⁴⁴ = 51398321199223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68990507243659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34495253621819 + 34495253621820.

It is an arithmetic number, because the mean of its divisors is an integer number (34495253621820).

Almost surely, 2^{68990507243639} is an apocalyptic number.

68990507243639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68990507243639 is an equidigital number, since it uses as much as digits as its factorization.

68990507243639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529079040, while the sum is 71.

The spelling of 68990507243639 in words is "sixty-eight trillion, nine hundred ninety billion, five hundred seven million, two hundred forty-three thousand, six hundred thirty-nine".