16918609920 has 128 divisors (see below), whose sum is σ = 54140298480. Its totient is φ = 4511498240.

The previous prime is 16918609913. The next prime is 16918609931. The reversal of 16918609920 is 2990681961.

It is a tau number, because it is divible by the number of its divisors (128).

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, 474310 + ... + 508730.

Almost surely, 2^16918609920 is an apocalyptic number.

16918609920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16918609920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27070149240).

16918609920 is an abundant number, since it is smaller than the sum of its proper divisors (37221688560).

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

16918609920 is an frugal number, since it uses more digits than its factorization.

16918609920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34459 (or 34431 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 51.

The spelling of 16918609920 in words is "sixteen billion, nine hundred eighteen million, six hundred nine thousand, nine hundred twenty".