16018736640 has 320 divisors, whose sum is σ = 53777129472. Its totient is φ = 4062412800.

The previous prime is 16018736623. The next prime is 16018736711. The reversal of 16018736640 is 4663781061.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16018736592 and 16018736601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14522329 + ... + 14523431.

Almost surely, 2^16018736640 is an apocalyptic number.

16018736640 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 16018736640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26888564736).

16018736640 is an abundant number, since it is smaller than the sum of its proper divisors (37758392832).

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

16018736640 is a wasteful number, since it uses less digits than its factorization.

16018736640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221 (or 1205 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 16018736640 in words is "sixteen billion, eighteen million, seven hundred thirty-six thousand, six hundred forty".