1561500055156 has 6 divisors (see below), whose sum is σ = 2732625096530. Its totient is φ = 780750027576.

The previous prime is 1561500055139. The next prime is 1561500055183. The reversal of 1561500055156 is 6515500051651.

It can be written as a sum of positive squares in only one way, i.e., 1091293622500 + 470206432656 = 1044650^2 + 685716^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195187506891 + ... + 195187506898.

Almost surely, 2^{1561500055156} is an apocalyptic number.

It is an amenable number.

1561500055156 is a deficient number, since it is larger than the sum of its proper divisors (1171125041374).

1561500055156 is a wasteful number, since it uses less digits than its factorization.

1561500055156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390375013793 (or 390375013791 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 1561500055156 in words is "one trillion, five hundred sixty-one billion, five hundred million, fifty-five thousand, one hundred fifty-six".