4026561553361 has 4 divisors (see below), whose sum is σ = 4026656265012. Its totient is φ = 4026466841712.

The previous prime is 4026561553321. The next prime is 4026561553363. The reversal of 4026561553361 is 1633551656204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1123269304336 + 2903292249025 = 1059844^2 + 1703905^2 .

It is a cyclic number.

It is not a de Polignac number, because 4026561553361 - 2¹⁸ = 4026561291217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4026561553363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47292026 + ... + 47377091.

It is an arithmetic number, because the mean of its divisors is an integer number (1006664066253).

Almost surely, 2^{4026561553361} is an apocalyptic number.

It is an amenable number.

4026561553361 is a deficient number, since it is larger than the sum of its proper divisors (94711651).

4026561553361 is an equidigital number, since it uses as much as digits as its factorization.

4026561553361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94711650.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 4026561553361 in words is "four trillion, twenty-six billion, five hundred sixty-one million, five hundred fifty-three thousand, three hundred sixty-one".