561666436 has 24 divisors (see below), whose sum is σ = 988775424. Its totient is φ = 279165600.

The previous prime is 561666431. The next prime is 561666437. The reversal of 561666436 is 634666165.

It is a junction number, because it is equal to n+sod(n) for n = 561666392 and 561666401.

It is not an unprimeable number, because it can be changed into a prime (561666431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800886 + ... + 801586.

It is an arithmetic number, because the mean of its divisors is an integer number (41198976).

Almost surely, 2^561666436 is an apocalyptic number.

It is an amenable number.

561666436 is a deficient number, since it is larger than the sum of its proper divisors (427108988).

561666436 is a wasteful number, since it uses less digits than its factorization.

561666436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611 (or 1609 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 561666436 is about 23699.5028639843. The cubic root of 561666436 is about 825.0738524643.

The spelling of 561666436 in words is "five hundred sixty-one million, six hundred sixty-six thousand, four hundred thirty-six".