163182873681 has 45 divisors (see below), whose sum is σ = 249472238379. Its totient is φ = 102786559632.

The previous prime is 163182873671. The next prime is 163182873683. The reversal of 163182873681 is 186378281361.

It is a happy number.

The square root of 163182873681 is 403959.

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

163182873681 is a `hidden beast` number, since 16 + 318 + 287 + 36 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 88699730625 + 74483143056 = 297825^2 + 272916^2 .

It is a de Polignac number, because none of the positive numbers 2^k-163182873681 is a prime.

It is a super-2 number, since 2×163182873681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163182873683) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 437487411 + ... + 437487783.

Almost surely, 2^163182873681 is an apocalyptic number.

163182873681 is the 403959-th square number.

163182873681 is the 201980-th centered octagonal number.

It is an amenable number.

163182873681 is a deficient number, since it is larger than the sum of its proper divisors (86289364698).

163182873681 is an frugal number, since it uses more digits than its factorization.

163182873681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 395 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 163182873681 in words is "one hundred sixty-three billion, one hundred eighty-two million, eight hundred seventy-three thousand, six hundred eighty-one".