16211373532225 has 9 divisors (see below), whose sum is σ = 20102128143267. Its totient is φ = 12969082720440.

The previous prime is 16211373532213. The next prime is 16211373532279. The reversal of 16211373532225 is 52223537311261.

The square root of 16211373532225 is 4026335.

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., 5836094471601 + 10375279060624 = 2415801^2 + 3221068^2 .

It is not a de Polignac number, because 16211373532225 - 2⁹ = 16211373531713 is a prime.

It is a super-2 number, since 2×16211373532225² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19729042 + ... + 20534308.

Almost surely, 2^{16211373532225} is an apocalyptic number.

16211373532225 is the 4026335-th square number.

16211373532225 is the 2013168-th centered octagonal number.

It is an amenable number.

16211373532225 is a deficient number, since it is larger than the sum of its proper divisors (3890754611042).

16211373532225 is an frugal number, since it uses more digits than its factorization.

16211373532225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610544 (or 805272 counting only the distinct ones).

The product of its digits is 453600, while the sum is 43.

The spelling of 16211373532225 in words is "sixteen trillion, two hundred eleven billion, three hundred seventy-three million, five hundred thirty-two thousand, two hundred twenty-five".