4026561553321 has 2 divisors, whose sum is σ = 4026561553322. Its totient is φ = 4026561553320.

The previous prime is 4026561553309. The next prime is 4026561553363. The reversal of 4026561553321 is 1233551656204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3945228787600 + 81332765721 = 1986260^2 + 285189^2 .

It is a cyclic number.

It is not a de Polignac number, because 4026561553321 - 2¹¹ = 4026561551273 is a prime.

It is a super-2 number, since 2×4026561553321² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4026561550321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2013280776660 + 2013280776661.

It is an arithmetic number, because the mean of its divisors is an integer number (2013280776661).

Almost surely, 2^{4026561553321} is an apocalyptic number.

It is an amenable number.

4026561553321 is a deficient number, since it is larger than the sum of its proper divisors (1).

4026561553321 is an equidigital number, since it uses as much as digits as its factorization.

4026561553321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 4026561553321 in words is "four trillion, twenty-six billion, five hundred sixty-one million, five hundred fifty-three thousand, three hundred twenty-one".