16381655 has 4 divisors (see below), whose sum is σ = 19657992. Its totient is φ = 13105320.

The previous prime is 16381649. The next prime is 16381657. The reversal of 16381655 is 55618361.

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

It is not a de Polignac number, because 16381655 - 2¹⁶ = 16316119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16381657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638161 + ... + 1638170.

It is an arithmetic number, because the mean of its divisors is an integer number (4914498).

Almost surely, 2^16381655 is an apocalyptic number.

16381655 is a deficient number, since it is larger than the sum of its proper divisors (3276337).

16381655 is an equidigital number, since it uses as much as digits as its factorization.

16381655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276336.

The product of its digits is 21600, while the sum is 35.

The square root of 16381655 is about 4047.4257250751. The cubic root of 16381655 is about 253.9720503687.

It can be divided in two parts, 163 and 81655, that added together give a palindrome (81818).

The spelling of 16381655 in words is "sixteen million, three hundred eighty-one thousand, six hundred fifty-five".