10561645243 has 4 divisors (see below), whose sum is σ = 10571221728. Its totient is φ = 10552068760.

The previous prime is 10561645217. The next prime is 10561645291. The reversal of 10561645243 is 34254616501.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10561645243 is a prime.

It is a super-2 number, since 2×10561645243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10561643243) 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, 4786588 + ... + 4788793.

It is an arithmetic number, because the mean of its divisors is an integer number (2642805432).

Almost surely, 2^10561645243 is an apocalyptic number.

10561645243 is a deficient number, since it is larger than the sum of its proper divisors (9576485).

10561645243 is an equidigital number, since it uses as much as digits as its factorization.

10561645243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9576484.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 10561645243 in words is "ten billion, five hundred sixty-one million, six hundred forty-five thousand, two hundred forty-three".