561645450 has 36 divisors (see below), whose sum is σ = 1508955318. Its totient is φ = 149772000.

The previous prime is 561645449. The next prime is 561645457. The reversal of 561645450 is 54546165.

561645450 is a `hidden beast` number, since 5 + 6 + 1 + 645 + 4 + 5 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 308740041 + 252905409 = 17571^2 + 15903^2 .

It is a super-2 number, since 2×561645450² = 630891223011405000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561645457) 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 17 ways as a sum of consecutive naturals, for example, 623601 + ... + 624500.

Almost surely, 2^561645450 is an apocalyptic number.

561645450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

561645450 is an abundant number, since it is smaller than the sum of its proper divisors (947309868).

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

561645450 is a wasteful number, since it uses less digits than its factorization.

561645450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248119 (or 1248111 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 561645450 is about 23699.0601079452. The cubic root of 561645450 is about 825.0635763678.

The spelling of 561645450 in words is "five hundred sixty-one million, six hundred forty-five thousand, four hundred fifty".