16611633440 has 48 divisors (see below), whose sum is σ = 39270841848. Its totient is φ = 6640275456.

The previous prime is 16611633421. The next prime is 16611633449. The reversal of 16611633440 is 4433611661.

It can be written as a sum of positive squares in 4 ways, for example, as 14470165264 + 2141468176 = 120292^2 + 46276^2 .

It is a super-3 number, since 3×16611633440³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16611633440.

It is not an unprimeable number, because it can be changed into a prime (16611633449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215054 + ... + 281906.

Almost surely, 2^16611633440 is an apocalyptic number.

16611633440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16611633440 is an abundant number, since it is smaller than the sum of its proper divisors (22659208408).

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

16611633440 is a wasteful number, since it uses less digits than its factorization.

16611633440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68421 (or 68413 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 16611633440 in words is "sixteen billion, six hundred eleven million, six hundred thirty-three thousand, four hundred forty".