16551106440 has 128 divisors (see below), whose sum is σ = 54250197120. Its totient is φ = 4006246400.

The previous prime is 16551106433. The next prime is 16551106463. The reversal of 16551106440 is 4460115561.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 884380 + ... + 902900.

It is an arithmetic number, because the mean of its divisors is an integer number (423829665).

Almost surely, 2^16551106440 is an apocalyptic number.

16551106440 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 16551106440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27125098560).

16551106440 is an abundant number, since it is smaller than the sum of its proper divisors (37699090680).

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

16551106440 is a wasteful number, since it uses less digits than its factorization.

16551106440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19223 (or 19219 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 16551106440 in words is "sixteen billion, five hundred fifty-one million, one hundred six thousand, four hundred forty".