161582316849 has 12 divisors (see below), whose sum is σ = 234132951156. Its totient is φ = 107381727072.

The previous prime is 161582316799. The next prime is 161582316937. The reversal of 161582316849 is 948613285161.

It is a happy number.

161582316849 is a `hidden beast` number, since 1 + 6 + 1 + 582 + 3 + 16 + 8 + 49 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 79896675600 + 81685641249 = 282660^2 + 285807^2 .

It is not a de Polignac number, because 161582316849 - 2²⁰ = 161581268273 is a prime.

It is a super-2 number, since 2×161582316849² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 161582316795 and 161582316804.

It is not an unprimeable number, because it can be changed into a prime (161582312849) 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, 28315114 + ... + 28320819.

It is an arithmetic number, because the mean of its divisors is an integer number (19511079263).

Almost surely, 2^161582316849 is an apocalyptic number.

It is an amenable number.

161582316849 is a deficient number, since it is larger than the sum of its proper divisors (72550634307).

161582316849 is a wasteful number, since it uses less digits than its factorization.

161582316849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56636256 (or 56636253 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 161582316849 in words is "one hundred sixty-one billion, five hundred eighty-two million, three hundred sixteen thousand, eight hundred forty-nine".