16135612440 has 128 divisors (see below), whose sum is σ = 51480576000. Its totient is φ = 4034285568.

The previous prime is 16135612391. The next prime is 16135612447. The reversal of 16135612440 is 4421653161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16135612447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184681 + ... + 257639.

It is an arithmetic number, because the mean of its divisors is an integer number (402192000).

Almost surely, 2^16135612440 is an apocalyptic number.

16135612440 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 16135612440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25740288000).

16135612440 is an abundant number, since it is smaller than the sum of its proper divisors (35344963560).

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

16135612440 is a wasteful number, since it uses less digits than its factorization.

16135612440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73089 (or 73085 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 16135612440 in words is "sixteen billion, one hundred thirty-five million, six hundred twelve thousand, four hundred forty".