16505435440 has 40 divisors (see below), whose sum is σ = 41327073648. Its totient is φ = 6094314240.

The previous prime is 16505435411. The next prime is 16505435497. The reversal of 16505435440 is 4453450561.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 16505435440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7934266 + ... + 7936345.

Almost surely, 2^16505435440 is an apocalyptic number.

16505435440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16505435440 is an abundant number, since it is smaller than the sum of its proper divisors (24821638208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16505435440 is a wasteful number, since it uses less digits than its factorization.

16505435440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15870637 (or 15870631 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 16505435440 in words is "sixteen billion, five hundred five million, four hundred thirty-five thousand, four hundred forty".