561663654 has 8 divisors (see below), whose sum is σ = 1123327320. Its totient is φ = 187221216.

The previous prime is 561663649. The next prime is 561663671. The reversal of 561663654 is 456366165.

561663654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

561663654 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46805299 + ... + 46805310.

It is an arithmetic number, because the mean of its divisors is an integer number (140415915).

Almost surely, 2^561663654 is an apocalyptic number.

561663654 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

561663654 is a wasteful number, since it uses less digits than its factorization.

561663654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93610614.

The product of its digits is 388800, while the sum is 42.

The square root of 561663654 is about 23699.4441706973. Note that the first 3 decimals coincide. The cubic root of 561663654 is about 825.0724902327.

The spelling of 561663654 in words is "five hundred sixty-one million, six hundred sixty-three thousand, six hundred fifty-four".