561643425 has 72 divisors (see below), whose sum is σ = 1176553664. Its totient is φ = 250750080.

The previous prime is 561643421. The next prime is 561643429. The reversal of 561643425 is 524346165.

561643425 is a `hidden beast` number, since 5 + 6 + 1 + 643 + 4 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (561643421) and next prime (561643429).

It is not a de Polignac number, because 561643425 - 2² = 561643421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 561643425.

It is not an unprimeable number, because it can be changed into a prime (561643421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 63579 + ... + 71871.

Almost surely, 2^561643425 is an apocalyptic number.

It is an amenable number.

561643425 is an abundant number, since it is smaller than the sum of its proper divisors (614910239).

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

561643425 is a wasteful number, since it uses less digits than its factorization.

561643425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8359 (or 8351 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 561643425 is about 23699.0173846934. The cubic root of 561643425 is about 825.0625847839.

The spelling of 561643425 in words is "five hundred sixty-one million, six hundred forty-three thousand, four hundred twenty-five".