561645866813011 has 4 divisors (see below), whose sum is σ = 565091546977672. Its totient is φ = 558200186648352.

The previous prime is 561645866812999. The next prime is 561645866813029. The reversal of 561645866813011 is 110318668546165.

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

It is a cyclic number.

It is not a de Polignac number, because 561645866813011 - 2¹⁹ = 561645866288723 is a prime.

It is a super-2 number, since 2×561645866813011² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561645866813071) 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, 1722840082086 + ... + 1722840082411.

It is an arithmetic number, because the mean of its divisors is an integer number (141272886744418).

Almost surely, 2^{561645866813011} is an apocalyptic number.

561645866813011 is a deficient number, since it is larger than the sum of its proper divisors (3445680164661).

561645866813011 is a wasteful number, since it uses less digits than its factorization.

561645866813011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445680164660.

The product of its (nonzero) digits is 24883200, while the sum is 61.

The spelling of 561645866813011 in words is "five hundred sixty-one trillion, six hundred forty-five billion, eight hundred sixty-six million, eight hundred thirteen thousand, eleven".