18946646417161 has 4 divisors (see below), whose sum is σ = 18979482893332. Its totient is φ = 18913809940992.

The previous prime is 18946646417123. The next prime is 18946646417197. The reversal of 18946646417161 is 16171464664981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12432252883600 + 6514393533561 = 3525940^2 + 2552331^2 .

It is a cyclic number.

It is not a de Polignac number, because 18946646417161 - 2¹⁷ = 18946646286089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18946646417093 and 18946646417102.

It is not an unprimeable number, because it can be changed into a prime (18946646415161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16418237220 + ... + 16418238373.

It is an arithmetic number, because the mean of its divisors is an integer number (4744870723333).

Almost surely, 2^{18946646417161} is an apocalyptic number.

It is an amenable number.

18946646417161 is a deficient number, since it is larger than the sum of its proper divisors (32836476171).

18946646417161 is an equidigital number, since it uses as much as digits as its factorization.

18946646417161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32836476170.

The product of its digits is 41803776, while the sum is 64.

The spelling of 18946646417161 in words is "eighteen trillion, nine hundred forty-six billion, six hundred forty-six million, four hundred seventeen thousand, one hundred sixty-one".