16549536025 has 27 divisors (see below), whose sum is σ = 22566255103. Its totient is φ = 12030880400.

The previous prime is 16549536013. The next prime is 16549536037. The reversal of 16549536025 is 52063594561.

The square root of 16549536025 is 128645.

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

It is an interprime number because it is at equal distance from previous prime (16549536013) and next prime (16549536037).

It can be written as a sum of positive squares in only one way, i.e., 5957832969 + 10591703056 = 77187^2 + 102916^2 .

It is not a de Polignac number, because 16549536025 - 2¹¹ = 16549533977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7074306 + ... + 7076644.

Almost surely, 2^16549536025 is an apocalyptic number.

16549536025 is the 128645-th square number.

16549536025 is the 64323-rd centered octagonal number.

It is an amenable number.

16549536025 is a deficient number, since it is larger than the sum of its proper divisors (6016719078).

16549536025 is an frugal number, since it uses more digits than its factorization.

16549536025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710 (or 2355 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 16549536025 in words is "sixteen billion, five hundred forty-nine million, five hundred thirty-six thousand, twenty-five".