61368255524321 has 2 divisors, whose sum is σ = 61368255524322. Its totient is φ = 61368255524320.

The previous prime is 61368255524299. The next prime is 61368255524339. The reversal of 61368255524321 is 12342555286316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52736934480400 + 8631321043921 = 7262020^2 + 2937911^2 .

It is a cyclic number.

It is not a de Polignac number, because 61368255524321 - 2¹⁰ = 61368255523297 is a prime.

It is a super-2 number, since 2×61368255524321² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61368255574321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30684127762160 + 30684127762161.

It is an arithmetic number, because the mean of its divisors is an integer number (30684127762161).

Almost surely, 2^{61368255524321} is an apocalyptic number.

It is an amenable number.

61368255524321 is a deficient number, since it is larger than the sum of its proper divisors (1).

61368255524321 is an equidigital number, since it uses as much as digits as its factorization.

61368255524321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368000, while the sum is 53.

The spelling of 61368255524321 in words is "sixty-one trillion, three hundred sixty-eight billion, two hundred fifty-five million, five hundred twenty-four thousand, three hundred twenty-one".