1561161113667 has 12 divisors (see below), whose sum is σ = 2256524963160. Its totient is φ = 1040075091648.

The previous prime is 1561161113647. The next prime is 1561161113669. The reversal of 1561161113667 is 7663111611651.

1561161113667 is a `hidden beast` number, since 1 + 5 + 6 + 11 + 611 + 13 + 6 + 6 + 7 = 666.

It is not a de Polignac number, because 1561161113667 - 2⁷ = 1561161113539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561161113669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58234533 + ... + 58261334.

It is an arithmetic number, because the mean of its divisors is an integer number (188043746930).

Almost surely, 2^{1561161113667} is an apocalyptic number.

1561161113667 is a deficient number, since it is larger than the sum of its proper divisors (695363849493).

1561161113667 is a wasteful number, since it uses less digits than its factorization.

1561161113667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116497362 (or 116497359 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The spelling of 1561161113667 in words is "one trillion, five hundred sixty-one billion, one hundred sixty-one million, one hundred thirteen thousand, six hundred sixty-seven".