29169565681 has 27 divisors (see below), whose sum is σ = 31446723873. Its totient is φ = 27053294400.

The previous prime is 29169565669. The next prime is 29169565709. The reversal of 29169565681 is 18656596192.

The square root of 29169565681 is 170791.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1845475681 + 27324090000 = 42959^2 + 165300^2 .

It is not a de Polignac number, because 29169565681 - 2¹³ = 29169557489 is a prime.

It is a super-2 number, since 2×29169565681² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29169565631) 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, 288807531 + ... + 288807631.

Almost surely, 2^29169565681 is an apocalyptic number.

29169565681 is the 170791-st square number.

29169565681 is the 85396-th centered octagonal number.

It is an amenable number.

29169565681 is a deficient number, since it is larger than the sum of its proper divisors (2277158192).

29169565681 is an frugal number, since it uses more digits than its factorization.

29169565681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 209 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 58.

The spelling of 29169565681 in words is "twenty-nine billion, one hundred sixty-nine million, five hundred sixty-five thousand, six hundred eighty-one".