10505105581 has 4 divisors (see below), whose sum is σ = 10506195964. Its totient is φ = 10504015200.

The previous prime is 10505105519. The next prime is 10505105587. The reversal of 10505105581 is 18550150501.

It is a happy number.

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 831399556 + 9673706025 = 28834^2 + 98355^2 .

It is a cyclic number.

It is not a de Polignac number, because 10505105581 - 2¹³ = 10505097389 is a prime.

It is a super-2 number, since 2×10505105581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10505105587) 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, 530610 + ... + 550051.

It is an arithmetic number, because the mean of its divisors is an integer number (2626548991).

Almost surely, 2^10505105581 is an apocalyptic number.

It is an amenable number.

10505105581 is a deficient number, since it is larger than the sum of its proper divisors (1090383).

10505105581 is an equidigital number, since it uses as much as digits as its factorization.

10505105581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090382.

The product of its (nonzero) digits is 5000, while the sum is 31.

The spelling of 10505105581 in words is "ten billion, five hundred five million, one hundred five thousand, five hundred eighty-one".