561664435 has 8 divisors (see below), whose sum is σ = 680946336. Its totient is φ = 444698880.

The previous prime is 561664423. The next prime is 561664447. The reversal of 561664435 is 534466165.

561664435 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (561664423) and next prime (561664447).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561664435 - 2²⁷ = 427446707 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578551 + ... + 579520.

It is an arithmetic number, because the mean of its divisors is an integer number (85118292).

Almost surely, 2^561664435 is an apocalyptic number.

561664435 is a deficient number, since it is larger than the sum of its proper divisors (119281901).

561664435 is a wasteful number, since it uses less digits than its factorization.

561664435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158173.

The product of its digits is 259200, while the sum is 40.

The square root of 561664435 is about 23699.4606478713. The cubic root of 561664435 is about 825.0728726569.

The spelling of 561664435 in words is "five hundred sixty-one million, six hundred sixty-four thousand, four hundred thirty-five".