561966444 has 48 divisors (see below), whose sum is σ = 1569027040. Its totient is φ = 172912320.

The previous prime is 561966443. The next prime is 561966479. The reversal of 561966444 is 444669165.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 561966444.

It is not an unprimeable number, because it can be changed into a prime (561966443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198727 + ... + 201534.

Almost surely, 2^561966444 is an apocalyptic number.

561966444 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

561966444 is an abundant number, since it is smaller than the sum of its proper divisors (1007060596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561966444 is a wasteful number, since it uses less digits than its factorization.

561966444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400287 (or 400279 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 561966444 is about 23705.8314344804. The cubic root of 561966444 is about 825.2207277162.

The spelling of 561966444 in words is "five hundred sixty-one million, nine hundred sixty-six thousand, four hundred forty-four".