561605505550 has 48 divisors (see below), whose sum is σ = 1068282964800. Its totient is φ = 219602448000.

The previous prime is 561605505547. The next prime is 561605505577. The reversal of 561605505550 is 55505506165.

It is a junction number, because it is equal to n+sod(n) for n = 561605505497 and 561605505506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304905 + ... + 1102804.

It is an arithmetic number, because the mean of its divisors is an integer number (22255895100).

Almost surely, 2^561605505550 is an apocalyptic number.

561605505550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

561605505550 is a deficient number, since it is larger than the sum of its proper divisors (506677459250).

561605505550 is a wasteful number, since it uses less digits than its factorization.

561605505550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407901 (or 1407896 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 43.

The spelling of 561605505550 in words is "five hundred sixty-one billion, six hundred five million, five hundred five thousand, five hundred fifty".