16505255533 has 8 divisors (see below), whose sum is σ = 17776152576. Its totient is φ = 15234538800.

The previous prime is 16505255491. The next prime is 16505255549. The reversal of 16505255533 is 33555250561.

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

It is not a de Polignac number, because 16505255533 - 2⁹ = 16505255021 is a prime.

It is a super-2 number, since 2×16505255533² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505250533) 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, 190788 + ... + 263458.

It is an arithmetic number, because the mean of its divisors is an integer number (2222019072).

Almost surely, 2^16505255533 is an apocalyptic number.

16505255533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16505255533 is a deficient number, since it is larger than the sum of its proper divisors (1270897043).

16505255533 is a wasteful number, since it uses less digits than its factorization.

16505255533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90155.

The product of its (nonzero) digits is 337500, while the sum is 40.

The spelling of 16505255533 in words is "sixteen billion, five hundred five million, two hundred fifty-five thousand, five hundred thirty-three".