16345555 has 4 divisors (see below), whose sum is σ = 19614672. Its totient is φ = 13076440.

The previous prime is 16345543. The next prime is 16345573. The reversal of 16345555 is 55554361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55554361 = 23 ⋅2415407.

It is not a de Polignac number, because 16345555 - 2⁵ = 16345523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16345555.

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, 1634551 + ... + 1634560.

It is an arithmetic number, because the mean of its divisors is an integer number (4903668).

Almost surely, 2^16345555 is an apocalyptic number.

16345555 is a deficient number, since it is larger than the sum of its proper divisors (3269117).

16345555 is an equidigital number, since it uses as much as digits as its factorization.

16345555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3269116.

The product of its digits is 45000, while the sum is 34.

The square root of 16345555 is about 4042.9636406973. The cubic root of 16345555 is about 253.7853550679.

It can be divided in two parts, 16345 and 555, that added together give a square (16900 = 130²).

The spelling of 16345555 in words is "sixteen million, three hundred forty-five thousand, five hundred fifty-five".