16663556442 has 64 divisors (see below), whose sum is σ = 37481584896. Its totient is φ = 4900346880.

The previous prime is 16663556431. The next prime is 16663556443. The reversal of 16663556442 is 24465536661.

It is a super-2 number, since 2×16663556442² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16663556391 and 16663556400.

It is not an unprimeable number, because it can be changed into a prime (16663556443) 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, 2783092 + ... + 2789072.

It is an arithmetic number, because the mean of its divisors is an integer number (585649764).

Almost surely, 2^16663556442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16663556442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18740792448).

16663556442 is an abundant number, since it is smaller than the sum of its proper divisors (20818028454).

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

16663556442 is a wasteful number, since it uses less digits than its factorization.

16663556442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7575.

The product of its digits is 3110400, while the sum is 48.

The spelling of 16663556442 in words is "sixteen billion, six hundred sixty-three million, five hundred fifty-six thousand, four hundred forty-two".