68638011945961 has 2 divisors, whose sum is σ = 68638011945962. Its totient is φ = 68638011945960.

The previous prime is 68638011945931. The next prime is 68638011945989. The reversal of 68638011945961 is 16954911083686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68453185038736 + 184826907225 = 8273644^2 + 429915^2 .

It is a cyclic number.

It is not a de Polignac number, because 68638011945961 - 2¹³ = 68638011937769 is a prime.

It is a super-2 number, since 2×68638011945961² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68638011945931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34319005972980 + 34319005972981.

It is an arithmetic number, because the mean of its divisors is an integer number (34319005972981).

Almost surely, 2^{68638011945961} is an apocalyptic number.

It is an amenable number.

68638011945961 is a deficient number, since it is larger than the sum of its proper divisors (1).

68638011945961 is an equidigital number, since it uses as much as digits as its factorization.

68638011945961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67184640, while the sum is 67.

The spelling of 68638011945961 in words is "sixty-eight trillion, six hundred thirty-eight billion, eleven million, nine hundred forty-five thousand, nine hundred sixty-one".