16571155441 has 9 divisors (see below), whose sum is σ = 16738752513. Its totient is φ = 16405223760.

The previous prime is 16571155427. The next prime is 16571155451. The reversal of 16571155441 is 14455117561.

The square root of 16571155441 is 128729.

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 6809715441 + 9761440000 = 82521^2 + 98800^2 .

It is not a de Polignac number, because 16571155441 - 2²³ = 16562766833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16571155394 and 16571155403.

It is not an unprimeable number, because it can be changed into a prime (16571155451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14030871 + ... + 14032051.

Almost surely, 2^16571155441 is an apocalyptic number.

16571155441 is the 128729-th square number.

16571155441 is the 64365-th centered octagonal number.

It is an amenable number.

16571155441 is a deficient number, since it is larger than the sum of its proper divisors (167597072).

16571155441 is an frugal number, since it uses more digits than its factorization.

16571155441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580 (or 1290 counting only the distinct ones).

The product of its digits is 84000, while the sum is 40.

The spelling of 16571155441 in words is "sixteen billion, five hundred seventy-one million, one hundred fifty-five thousand, four hundred forty-one".