561665341 has 4 divisors (see below), whose sum is σ = 562838400. Its totient is φ = 560492284.

The previous prime is 561665333. The next prime is 561665371. The reversal of 561665341 is 143566165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 143566165 = 5 ⋅28713233.

It is a cyclic number.

It is not a de Polignac number, because 561665341 - 2³ = 561665333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561665341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561665311) 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, 585811 + ... + 586768.

It is an arithmetic number, because the mean of its divisors is an integer number (140709600).

Almost surely, 2^561665341 is an apocalyptic number.

It is an amenable number.

561665341 is a deficient number, since it is larger than the sum of its proper divisors (1173059).

561665341 is a wasteful number, since it uses less digits than its factorization.

561665341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173058.

The product of its digits is 64800, while the sum is 37.

The square root of 561665341 is about 23699.4797622226. The cubic root of 561665341 is about 825.0733162881.

The spelling of 561665341 in words is "five hundred sixty-one million, six hundred sixty-five thousand, three hundred forty-one".