55561061050505 has 4 divisors (see below), whose sum is σ = 66673273260612. Its totient is φ = 44448848840400.

The previous prime is 55561061050447. The next prime is 55561061050519. The reversal of 55561061050505 is 50505016016555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33390646199296 + 22170414851209 = 5778464^2 + 4708547^2 .

It is a de Polignac number, because none of the positive numbers 2^k-55561061050505 is a prime.

It is a Duffinian 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, 5556106105046 + ... + 5556106105055.

It is an arithmetic number, because the mean of its divisors is an integer number (16668318315153).

Almost surely, 2^{55561061050505} is an apocalyptic number.

It is an amenable number.

55561061050505 is a deficient number, since it is larger than the sum of its proper divisors (11112212210107).

55561061050505 is a wasteful number, since it uses less digits than its factorization.

55561061050505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112212210106.

The product of its (nonzero) digits is 562500, while the sum is 44.

The spelling of 55561061050505 in words is "fifty-five trillion, five hundred sixty-one billion, sixty-one million, fifty thousand, five hundred five".