561194727867 has 8 divisors (see below), whose sum is σ = 831399596880. Its totient is φ = 374129818560.

The previous prime is 561194727851. The next prime is 561194727881. The reversal of 561194727867 is 768727491165.

561194727867 is a `hidden beast` number, since 5 + 611 + 9 + 4 + 7 + 2 + 7 + 8 + 6 + 7 = 666.

It is not a de Polignac number, because 561194727867 - 2⁴ = 561194727851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561194727827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10392494934 + ... + 10392494987.

It is an arithmetic number, because the mean of its divisors is an integer number (103924949610).

Almost surely, 2^561194727867 is an apocalyptic number.

561194727867 is a deficient number, since it is larger than the sum of its proper divisors (270204869013).

561194727867 is a wasteful number, since it uses less digits than its factorization.

561194727867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20784989930 (or 20784989924 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 561194727867 in words is "five hundred sixty-one billion, one hundred ninety-four million, seven hundred twenty-seven thousand, eight hundred sixty-seven".