161796166441 has 32 divisors (see below), whose sum is σ = 200949593600. Its totient is φ = 126851443200.

The previous prime is 161796166439. The next prime is 161796166489. The reversal of 161796166441 is 144661697161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 161796166441 - 2¹ = 161796166439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161796166141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5605675 + ... + 5634463.

It is an arithmetic number, because the mean of its divisors is an integer number (6279674800).

Almost surely, 2^161796166441 is an apocalyptic number.

It is an amenable number.

161796166441 is a deficient number, since it is larger than the sum of its proper divisors (39153427159).

161796166441 is a wasteful number, since it uses less digits than its factorization.

161796166441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29369.

The product of its digits is 1306368, while the sum is 52.

The spelling of 161796166441 in words is "one hundred sixty-one billion, seven hundred ninety-six million, one hundred sixty-six thousand, four hundred forty-one".