16505216440 has 32 divisors (see below), whose sum is σ = 37257731280. Its totient is φ = 6580576512.

The previous prime is 16505216423. The next prime is 16505216467. The reversal of 16505216440 is 4461250561.

It is a junction number, because it is equal to n+sod(n) for n = 16505216396 and 16505216405.

It is a congruent number.

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, 659757 + ... + 684316.

Almost surely, 2^16505216440 is an apocalyptic number.

16505216440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16505216440 is an abundant number, since it is smaller than the sum of its proper divisors (20752514840).

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

16505216440 is a wasteful number, since it uses less digits than its factorization.

16505216440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344391 (or 1344387 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 16505216440 in words is "sixteen billion, five hundred five million, two hundred sixteen thousand, four hundred forty".