161566712847 has 24 divisors (see below), whose sum is σ = 245675929824. Its totient is φ = 102116281344.

The previous prime is 161566712837. The next prime is 161566712861. The reversal of 161566712847 is 748217665161.

161566712847 is a `hidden beast` number, since 1 + 6 + 1 + 566 + 71 + 2 + 8 + 4 + 7 = 666.

It is not a de Polignac number, because 161566712847 - 2⁴ = 161566712831 is a prime.

It is a super-2 number, since 2×161566712847² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161566712793 and 161566712802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161566712837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3430218 + ... + 3476999.

It is an arithmetic number, because the mean of its divisors is an integer number (10236497076).

Almost surely, 2^161566712847 is an apocalyptic number.

161566712847 is a deficient number, since it is larger than the sum of its proper divisors (84109216977).

161566712847 is a wasteful number, since it uses less digits than its factorization.

161566712847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907359 (or 6907356 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 161566712847 in words is "one hundred sixty-one billion, five hundred sixty-six million, seven hundred twelve thousand, eight hundred forty-seven".