161563512177 has 24 divisors (see below), whose sum is σ = 233757407520. Its totient is φ = 107530133760.

The previous prime is 161563512163. The next prime is 161563512191. The reversal of 161563512177 is 771215365161.

161563512177 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 63 + 512 + 1 + 77 = 666.

It is an interprime number because it is at equal distance from previous prime (161563512163) and next prime (161563512191).

It is not a de Polignac number, because 161563512177 - 2⁴ = 161563512161 is a prime.

It is a super-2 number, since 2×161563512177² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161563512127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16503078 + ... + 16512864.

It is an arithmetic number, because the mean of its divisors is an integer number (9739891980).

Almost surely, 2^161563512177 is an apocalyptic number.

It is an amenable number.

161563512177 is a deficient number, since it is larger than the sum of its proper divisors (72193895343).

161563512177 is a wasteful number, since it uses less digits than its factorization.

161563512177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12653 (or 12650 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The spelling of 161563512177 in words is "one hundred sixty-one billion, five hundred sixty-three million, five hundred twelve thousand, one hundred seventy-seven".