16423818022161 has 81 divisors (see below), whose sum is σ = 26239896720219. Its totient is φ = 9891661744800.

The previous prime is 16423818022159. The next prime is 16423818022163. The reversal of 16423818022161 is 16122081832461.

The square root of 16423818022161 is 4052631.

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

16423818022161 is a `hidden beast` number, since 1 + 6 + 42 + 381 + 8 + 0 + 221 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (16423818022159) and next prime (16423818022163).

It can be written as a sum of positive squares in only one way, i.e., 6525117733761 + 9898700288400 = 2554431^2 + 3146220^2 .

It is not a de Polignac number, because 16423818022161 - 2¹ = 16423818022159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16423818022163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 30358258551 + ... + 30358259091.

Almost surely, 2^{16423818022161} is an apocalyptic number.

16423818022161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16423818022161 is the 4052631-st square number.

16423818022161 is the 2026316-th centered octagonal number.

It is an amenable number.

16423818022161 is a deficient number, since it is larger than the sum of its proper divisors (9816078698058).

16423818022161 is an frugal number, since it uses more digits than its factorization.

16423818022161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 16423818022161 in words is "sixteen trillion, four hundred twenty-three billion, eight hundred eighteen million, twenty-two thousand, one hundred sixty-one".