11858511817161 has 27 divisors (see below), whose sum is σ = 17189535279501. Its totient is φ = 7877815667064.

The previous prime is 11858511817151. The next prime is 11858511817183. The reversal of 11858511817161 is 16171811585811.

The square root of 11858511817161 is 3443619.

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

11858511817161 is a `hidden beast` number, since 1 + 1 + 8 + 58 + 511 + 8 + 1 + 71 + 6 + 1 = 666.

It is not a de Polignac number, because 11858511817161 - 2¹⁷ = 11858511686089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11858511817098 and 11858511817107.

It is not an unprimeable number, because it can be changed into a prime (11858511817151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3171571230 + ... + 3171574968.

Almost surely, 2^{11858511817161} is an apocalyptic number.

11858511817161 is the 3443619-th square number.

11858511817161 is the 1721810-th centered octagonal number.

It is an amenable number.

11858511817161 is a deficient number, since it is larger than the sum of its proper divisors (5331023462340).

11858511817161 is an frugal number, since it uses more digits than its factorization.

11858511817161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8098 (or 4049 counting only the distinct ones).

The product of its digits is 537600, while the sum is 54.

The spelling of 11858511817161 in words is "eleven trillion, eight hundred fifty-eight billion, five hundred eleven million, eight hundred seventeen thousand, one hundred sixty-one".