68123988330557 has 2 divisors, whose sum is σ = 68123988330558. Its totient is φ = 68123988330556.

The previous prime is 68123988330547. The next prime is 68123988330623. The reversal of 68123988330557 is 75503388932186.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62670988083001 + 5453000247556 = 7916501^2 + 2335166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68123988330557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68123988330547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34061994165278 + 34061994165279.

It is an arithmetic number, because the mean of its divisors is an integer number (34061994165279).

Almost surely, 2^{68123988330557} is an apocalyptic number.

It is an amenable number.

68123988330557 is a deficient number, since it is larger than the sum of its proper divisors (1).

68123988330557 is an equidigital number, since it uses as much as digits as its factorization.

68123988330557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 261273600, while the sum is 68.

The spelling of 68123988330557 in words is "sixty-eight trillion, one hundred twenty-three billion, nine hundred eighty-eight million, three hundred thirty thousand, five hundred fifty-seven".