161862187041 has 27 divisors (see below), whose sum is σ = 237935508499. Its totient is φ = 106032504192.

The previous prime is 161862187033. The next prime is 161862187103. The reversal of 161862187041 is 140781268161.

The square root of 161862187041 is 402321.

It is a perfect power (a square), and thus also a powerful number.

161862187041 is a `hidden beast` number, since 1 + 6 + 18 + 621 + 8 + 7 + 0 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 144145512225 + 17716674816 = 379665^2 + 133104^2 .

It is not a de Polignac number, because 161862187041 - 2³ = 161862187033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161862187031) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 71209681 + ... + 71211953.

Almost surely, 2^161862187041 is an apocalyptic number.

161862187041 is the 402321-st square number.

161862187041 is the 201161-st centered octagonal number.

It is an amenable number.

161862187041 is a deficient number, since it is larger than the sum of its proper divisors (76073321458).

161862187041 is an frugal number, since it uses more digits than its factorization.

161862187041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670 (or 2335 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 161862187041 in words is "one hundred sixty-one billion, eight hundred sixty-two million, one hundred eighty-seven thousand, forty-one".