161145406791 has 12 divisors (see below), whose sum is σ = 232784148168. Its totient is φ = 107421704784.

The previous prime is 161145406789. The next prime is 161145406867. The reversal of 161145406791 is 197604541161.

It is a happy number.

161145406791 is a `hidden beast` number, since 1 + 6 + 1 + 14 + 540 + 6 + 7 + 91 = 666.

It is not a de Polignac number, because 161145406791 - 2¹ = 161145406789 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161145406711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 593665 + ... + 821418.

It is an arithmetic number, because the mean of its divisors is an integer number (19398679014).

Almost surely, 2^161145406791 is an apocalyptic number.

161145406791 is a deficient number, since it is larger than the sum of its proper divisors (71638741377).

161145406791 is a wasteful number, since it uses less digits than its factorization.

161145406791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427742 (or 1427739 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 161145406791 in words is "one hundred sixty-one billion, one hundred forty-five million, four hundred six thousand, seven hundred ninety-one".