5438779526321 has 2 divisors, whose sum is σ = 5438779526322. Its totient is φ = 5438779526320.

The previous prime is 5438779526273. The next prime is 5438779526329. The reversal of 5438779526321 is 1236259778345.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3914209006096 + 1524570520225 = 1978436^2 + 1234735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5438779526321 is a prime.

It is a super-2 number, since 2×5438779526321² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5438779526329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2719389763160 + 2719389763161.

It is an arithmetic number, because the mean of its divisors is an integer number (2719389763161).

Almost surely, 2^{5438779526321} is an apocalyptic number.

It is an amenable number.

5438779526321 is a deficient number, since it is larger than the sum of its proper divisors (1).

5438779526321 is an equidigital number, since it uses as much as digits as its factorization.

5438779526321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76204800, while the sum is 62.

The spelling of 5438779526321 in words is "five trillion, four hundred thirty-eight billion, seven hundred seventy-nine million, five hundred twenty-six thousand, three hundred twenty-one".