16553546646025 has 9 divisors (see below), whose sum is σ = 20526423066453. Its totient is φ = 13242821042400.

The previous prime is 16553546645971. The next prime is 16553546646067. The reversal of 16553546646025 is 52064664535561.

The square root of 16553546646025 is 4068605.

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 3918962651769 + 12634583994256 = 1979637^2 + 3554516^2 .

It is not a de Polignac number, because 16553546646025 - 2³³ = 16544956711433 is a prime.

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, 19936165 + ... + 20749885.

Almost surely, 2^{16553546646025} is an apocalyptic number.

16553546646025 is the 4068605-th square number.

16553546646025 is the 2034303-rd centered octagonal number.

It is an amenable number.

16553546646025 is a deficient number, since it is larger than the sum of its proper divisors (3972876420428).

16553546646025 is an frugal number, since it uses more digits than its factorization.

16553546646025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627452 (or 813726 counting only the distinct ones).

The product of its (nonzero) digits is 77760000, while the sum is 58.

The spelling of 16553546646025 in words is "sixteen trillion, five hundred fifty-three billion, five hundred forty-six million, six hundred forty-six thousand, twenty-five".