16440479553 has 4 divisors (see below), whose sum is σ = 21920639408. Its totient is φ = 10960319700.

The previous prime is 16440479537. The next prime is 16440479563. The reversal of 16440479553 is 35597404461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16440479553 - 2⁴ = 16440479537 is a prime.

It is a super-3 number, since 3×16440479553³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16440479513) 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, 2740079923 + ... + 2740079928.

It is an arithmetic number, because the mean of its divisors is an integer number (5480159852).

Almost surely, 2^16440479553 is an apocalyptic number.

It is an amenable number.

16440479553 is a deficient number, since it is larger than the sum of its proper divisors (5480159855).

16440479553 is an equidigital number, since it uses as much as digits as its factorization.

16440479553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480159854.

The product of its (nonzero) digits is 1814400, while the sum is 48.

The spelling of 16440479553 in words is "sixteen billion, four hundred forty million, four hundred seventy-nine thousand, five hundred fifty-three".