561052161161 has 4 divisors (see below), whose sum is σ = 561259117824. Its totient is φ = 560845204500.

The previous prime is 561052161133. The next prime is 561052161179. The reversal of 561052161161 is 161161250165.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561052161161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561052161121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103474265 + ... + 103479686.

It is an arithmetic number, because the mean of its divisors is an integer number (140314779456).

Almost surely, 2^561052161161 is an apocalyptic number.

It is an amenable number.

561052161161 is a deficient number, since it is larger than the sum of its proper divisors (206956663).

561052161161 is a wasteful number, since it uses less digits than its factorization.

561052161161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206956662.

The product of its (nonzero) digits is 10800, while the sum is 35.

The spelling of 561052161161 in words is "five hundred sixty-one billion, fifty-two million, one hundred sixty-one thousand, one hundred sixty-one".