561211016617 has 4 divisors (see below), whose sum is σ = 561256696660. Its totient is φ = 561165336576.

The previous prime is 561211016603. The next prime is 561211016621. The reversal of 561211016617 is 716610112165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716610112165 = 5 ⋅143322022433.

It can be written as a sum of positive squares in 2 ways, for example, as 469219520016 + 91991496601 = 684996^2 + 303301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561211016617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561211010617) 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, 22821588 + ... + 22846165.

It is an arithmetic number, because the mean of its divisors is an integer number (140314174165).

Almost surely, 2^561211016617 is an apocalyptic number.

It is an amenable number.

561211016617 is a deficient number, since it is larger than the sum of its proper divisors (45680043).

561211016617 is a wasteful number, since it uses less digits than its factorization.

561211016617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45680042.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 561211016617 in words is "five hundred sixty-one billion, two hundred eleven million, sixteen thousand, six hundred seventeen".