165503213103 has 8 divisors (see below), whose sum is σ = 220685651248. Its totient is φ = 110328125184.

The previous prime is 165503213087. The next prime is 165503213143. The reversal of 165503213103 is 301312305561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165503213103 - 2⁴ = 165503213087 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 (165503213143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1784800 + ... + 1875237.

It is an arithmetic number, because the mean of its divisors is an integer number (27585706406).

Almost surely, 2^165503213103 is an apocalyptic number.

165503213103 is a deficient number, since it is larger than the sum of its proper divisors (55182438145).

165503213103 is a wasteful number, since it uses less digits than its factorization.

165503213103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3675113.

The product of its (nonzero) digits is 8100, while the sum is 30.

Adding to 165503213103 its reverse (301312305561), we get a palindrome (466815518664).

The spelling of 165503213103 in words is "one hundred sixty-five billion, five hundred three million, two hundred thirteen thousand, one hundred three".