561613366 has 4 divisors (see below), whose sum is σ = 842420052. Its totient is φ = 280806682.

The previous prime is 561613357. The next prime is 561613369. The reversal of 561613366 is 663316165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 663316165 = 5 ⋅132663233.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561613369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140403340 + ... + 140403343.

It is an arithmetic number, because the mean of its divisors is an integer number (210605013).

Almost surely, 2^561613366 is an apocalyptic number.

561613366 is a deficient number, since it is larger than the sum of its proper divisors (280806686).

561613366 is a wasteful number, since it uses less digits than its factorization.

561613366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280806685.

The product of its digits is 58320, while the sum is 37.

The square root of 561613366 is about 23698.3831937962. The cubic root of 561613366 is about 825.0478654812.

The spelling of 561613366 in words is "five hundred sixty-one million, six hundred thirteen thousand, three hundred sixty-six".