16855120440 has 64 divisors (see below), whose sum is σ = 56183738400. Its totient is φ = 4494698496.

The previous prime is 16855120433. The next prime is 16855120463. The reversal of 16855120440 is 4402155861.

It is a happy number.

16855120440 is a `hidden beast` number, since 1 + 68 + 551 + 2 + 0 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16855120395 and 16855120404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7802217 + ... + 7804376.

Almost surely, 2^16855120440 is an apocalyptic number.

16855120440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16855120440 is an abundant number, since it is smaller than the sum of its proper divisors (39328617960).

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

16855120440 is a wasteful number, since it uses less digits than its factorization.

16855120440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606613 (or 15606603 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 16855120440 in words is "sixteen billion, eight hundred fifty-five million, one hundred twenty thousand, four hundred forty".