16616237440 has 128 divisors (see below), whose sum is σ = 43408548000. Its totient is φ = 6031933440.

The previous prime is 16616237431. The next prime is 16616237453. The reversal of 16616237440 is 4473261661.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 16616237393 and 16616237402.

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, 4989696 + ... + 4993024.

Almost surely, 2^16616237440 is an apocalyptic number.

16616237440 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 16616237440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21704274000).

16616237440 is an abundant number, since it is smaller than the sum of its proper divisors (26792310560).

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

16616237440 is a wasteful number, since it uses less digits than its factorization.

16616237440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068 (or 4056 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 16616237440 in words is "sixteen billion, six hundred sixteen million, two hundred thirty-seven thousand, four hundred forty".