16550565201 has 81 divisors (see below), whose sum is σ = 26363238993. Its totient is φ = 10003746240.

The previous prime is 16550565181. The next prime is 16550565209. The reversal of 16550565201 is 10256505561.

The square root of 16550565201 is 128649.

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

16550565201 is a `hidden beast` number, since 1 + 6 + 550 + 56 + 52 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 364619025 + 16185946176 = 19095^2 + 127224^2 .

It is not a de Polignac number, because 16550565201 - 2¹¹ = 16550563153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16550565209) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 271320711 + ... + 271320771.

Almost surely, 2^16550565201 is an apocalyptic number.

16550565201 is the 128649-th square number.

16550565201 is the 64325-th centered octagonal number.

It is an amenable number.

16550565201 is a deficient number, since it is larger than the sum of its proper divisors (9812673792).

16550565201 is an equidigital number, since it uses as much as digits as its factorization.

16550565201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

Multiplying 16550565201 by its sum of digits (36), we get a square (595820347236 = 771894²).

The spelling of 16550565201 in words is "sixteen billion, five hundred fifty million, five hundred sixty-five thousand, two hundred one".