16553257 has 16 divisors (see below), whose sum is σ = 20224512. Its totient is φ = 13224960.

The previous prime is 16553249. The next prime is 16553279. The reversal of 16553257 is 75235561.

It is not a de Polignac number, because 16553257 - 2³ = 16553249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16553057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12832 + ... + 14062.

It is an arithmetic number, because the mean of its divisors is an integer number (1264032).

Almost surely, 2^16553257 is an apocalyptic number.

16553257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16553257 is a deficient number, since it is larger than the sum of its proper divisors (3671255).

16553257 is a wasteful number, since it uses less digits than its factorization.

16553257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its digits is 31500, while the sum is 34.

The square root of 16553257 is about 4068.5694045942. The cubic root of 16553257 is about 254.8557790144.

The spelling of 16553257 in words is "sixteen million, five hundred fifty-three thousand, two hundred fifty-seven".