10000561055981 has 8 divisors (see below), whose sum is σ = 10004388170424. Its totient is φ = 9996734684160.

The previous prime is 10000561055893. The next prime is 10000561055993. The reversal of 10000561055981 is 18955016500001.

It can be written as a sum of positive squares in 4 ways, for example, as 4912983075625 + 5087577980356 = 2216525^2 + 2255566^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10000561055981 - 2³⁸ = 9725683149037 is a prime.

It is a super-2 number, since 2×10000561055981² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000561058981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27538811 + ... + 27899591.

It is an arithmetic number, because the mean of its divisors is an integer number (1250548521303).

Almost surely, 2^{10000561055981} is an apocalyptic number.

It is an amenable number.

10000561055981 is a deficient number, since it is larger than the sum of its proper divisors (3827114443).

10000561055981 is an equidigital number, since it uses as much as digits as its factorization.

10000561055981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371311.

The product of its (nonzero) digits is 54000, while the sum is 41.

Adding to 10000561055981 its reverse (18955016500001), we get a palindrome (28955577555982).

The spelling of 10000561055981 in words is "ten trillion, five hundred sixty-one million, fifty-five thousand, nine hundred eighty-one".