161847682653581 has 16 divisors (see below), whose sum is σ = 169309122808320. Its totient is φ = 154421640172800.

The previous prime is 161847682653541. The next prime is 161847682653593. The reversal of 161847682653581 is 185356286748161.

161847682653581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161847682653581 - 2¹⁴ = 161847682637197 is a prime.

It is a super-4 number, since 4×161847682653581⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161847682653521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547080380 + ... + 547376138.

It is an arithmetic number, because the mean of its divisors is an integer number (10581820175520).

Almost surely, 2^{161847682653581} is an apocalyptic number.

It is an amenable number.

161847682653581 is a deficient number, since it is larger than the sum of its proper divisors (7461440154739).

161847682653581 is a wasteful number, since it uses less digits than its factorization.

161847682653581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355516.

The product of its digits is 464486400, while the sum is 71.

The spelling of 161847682653581 in words is "one hundred sixty-one trillion, eight hundred forty-seven billion, six hundred eighty-two million, six hundred fifty-three thousand, five hundred eighty-one".