505561656 has 32 divisors (see below), whose sum is σ = 1284627600. Its totient is φ = 165757440.

The previous prime is 505561649. The next prime is 505561663. The reversal of 505561656 is 656165505.

It is an interprime number because it is at equal distance from previous prime (505561649) and next prime (505561663).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171201 + ... + 174128.

Almost surely, 2^505561656 is an apocalyptic number.

It is an amenable number.

505561656 is an abundant number, since it is smaller than the sum of its proper divisors (779065944).

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

505561656 is a wasteful number, since it uses less digits than its factorization.

505561656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345399 (or 345395 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 505561656 is about 22484.6982634858. The cubic root of 505561656 is about 796.6325409968.

The spelling of 505561656 in words is "five hundred five million, five hundred sixty-one thousand, six hundred fifty-six".