16218277201 has 45 divisors (see below), whose sum is σ = 19955161499. Its totient is φ = 13179300288.

The previous prime is 16218277193. The next prime is 16218277211. The reversal of 16218277201 is 10277281261.

The square root of 16218277201 is 127351.

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

It can be written as a sum of positive squares in only one way, i.e., 285779025 + 15932498176 = 16905^2 + 126224^2 .

It is not a de Polignac number, because 16218277201 - 2³ = 16218277193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16218277211) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 143524521 + ... + 143524633.

Almost surely, 2^16218277201 is an apocalyptic number.

16218277201 is the 127351-st square number.

16218277201 is the 63676-th centered octagonal number.

It is an amenable number.

16218277201 is a deficient number, since it is larger than the sum of its proper divisors (3736884298).

16218277201 is an frugal number, since it uses more digits than its factorization.

16218277201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 16218277201 in words is "sixteen billion, two hundred eighteen million, two hundred seventy-seven thousand, two hundred one".