54639344393681 has 2 divisors, whose sum is σ = 54639344393682. Its totient is φ = 54639344393680.

The previous prime is 54639344393617. The next prime is 54639344393707. The reversal of 54639344393681 is 18639344393645.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49064197013056 + 5575147380625 = 7004584^2 + 2361175^2 .

It is a cyclic number.

It is not a de Polignac number, because 54639344393681 - 2⁶ = 54639344393617 is a prime.

It is a super-2 number, since 2×54639344393681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54639344393611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27319672196840 + 27319672196841.

It is an arithmetic number, because the mean of its divisors is an integer number (27319672196841).

Almost surely, 2^{54639344393681} is an apocalyptic number.

It is an amenable number.

54639344393681 is a deficient number, since it is larger than the sum of its proper divisors (1).

54639344393681 is an equidigital number, since it uses as much as digits as its factorization.

54639344393681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604661760, while the sum is 68.

The spelling of 54639344393681 in words is "fifty-four trillion, six hundred thirty-nine billion, three hundred forty-four million, three hundred ninety-three thousand, six hundred eighty-one".