16553855 has 4 divisors (see below), whose sum is σ = 19864632. Its totient is φ = 13243080.

The previous prime is 16553833. The next prime is 16553879. The reversal of 16553855 is 55835561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16553855 - 2⁸ = 16553599 is a prime.

It is a super-2 number, since 2×16553855² = 548060230722050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655381 + ... + 1655390.

It is an arithmetic number, because the mean of its divisors is an integer number (4966158).

Almost surely, 2^16553855 is an apocalyptic number.

16553855 is a deficient number, since it is larger than the sum of its proper divisors (3310777).

16553855 is an equidigital number, since it uses as much as digits as its factorization.

16553855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310776.

The product of its digits is 90000, while the sum is 38.

The square root of 16553855 is about 4068.6428941356. The cubic root of 16553855 is about 254.8588479355.

The spelling of 16553855 in words is "sixteen million, five hundred fifty-three thousand, eight hundred fifty-five".