561010550111 has 4 divisors (see below), whose sum is σ = 612011509224. Its totient is φ = 510009591000.

The previous prime is 561010550077. The next prime is 561010550123. The reversal of 561010550111 is 111055010165.

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 561010550111 - 2³⁴ = 543830680927 is a prime.

It is a super-2 number, since 2×561010550111² (a number of 24 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 (561010550171) 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, 25500479540 + ... + 25500479561.

It is an arithmetic number, because the mean of its divisors is an integer number (153002877306).

Almost surely, 2^561010550111 is an apocalyptic number.

561010550111 is a deficient number, since it is larger than the sum of its proper divisors (51000959113).

561010550111 is a wasteful number, since it uses less digits than its factorization.

561010550111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51000959112.

The product of its (nonzero) digits is 750, while the sum is 26.

Adding to 561010550111 its reverse (111055010165), we get a palindrome (672065560276).

The spelling of 561010550111 in words is "five hundred sixty-one billion, ten million, five hundred fifty thousand, one hundred eleven".