161256340017 has 6 divisors (see below), whose sum is σ = 232925824482. Its totient is φ = 107504226672.

The previous prime is 161256339961. The next prime is 161256340019. The reversal of 161256340017 is 710043652161.

161256340017 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 5 + 634 + 0 + 0 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 160960637601 + 295702416 = 401199^2 + 17196^2 .

It is not a de Polignac number, because 161256340017 - 2⁷ = 161256339889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161256340019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8958685548 + ... + 8958685565.

It is an arithmetic number, because the mean of its divisors is an integer number (38820970747).

Almost surely, 2^161256340017 is an apocalyptic number.

It is an amenable number.

161256340017 is a deficient number, since it is larger than the sum of its proper divisors (71669484465).

161256340017 is a wasteful number, since it uses less digits than its factorization.

161256340017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17917371119 (or 17917371116 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

Adding to 161256340017 its reverse (710043652161), we get a palindrome (871299992178).

The spelling of 161256340017 in words is "one hundred sixty-one billion, two hundred fifty-six million, three hundred forty thousand, seventeen".