561663245 has 24 divisors (see below), whose sum is σ = 797837208. Its totient is φ = 377055360.

The previous prime is 561663217. The next prime is 561663259. The reversal of 561663245 is 542366165.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9084196 + 552579049 = 3014^2 + 23507^2 .

It is not a de Polignac number, because 561663245 - 2¹⁶ = 561597709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561663199 and 561663208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27842 + ... + 43571.

It is an arithmetic number, because the mean of its divisors is an integer number (33243217).

Almost surely, 2^561663245 is an apocalyptic number.

561663245 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561663245 is a deficient number, since it is larger than the sum of its proper divisors (236173963).

561663245 is a wasteful number, since it uses less digits than its factorization.

561663245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71453 (or 71442 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 561663245 is about 23699.4355418014. The cubic root of 561663245 is about 825.0722899618.

The spelling of 561663245 in words is "five hundred sixty-one million, six hundred sixty-three thousand, two hundred forty-five".