1561500416550 has 96 divisors (see below), whose sum is σ = 4216901529600. Its totient is φ = 380881388160.

The previous prime is 1561500416537. The next prime is 1561500416587. The reversal of 1561500416550 is 556140051651.

It is a junction number, because it is equal to n+sod(n) for n = 1561500416499 and 1561500416508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9363814 + ... + 9529113.

It is an arithmetic number, because the mean of its divisors is an integer number (43926057600).

Almost surely, 2^{1561500416550} is an apocalyptic number.

1561500416550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561500416550 is an abundant number, since it is smaller than the sum of its proper divisors (2655401113050).

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

1561500416550 is a wasteful number, since it uses less digits than its factorization.

1561500416550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18892990 (or 18892985 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 1561500416550 in words is "one trillion, five hundred sixty-one billion, five hundred million, four hundred sixteen thousand, five hundred fifty".