16202255665638 has 256 divisors, whose sum is σ = 40226686746624. Its totient is φ = 4249987315200.

The previous prime is 16202255665559. The next prime is 16202255665643. The reversal of 16202255665638 is 83656655220261.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2174503813 + ... + 2174511263.

It is an arithmetic number, because the mean of its divisors is an integer number (157135495104).

Almost surely, 2^{16202255665638} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16202255665638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20113343373312).

16202255665638 is an abundant number, since it is smaller than the sum of its proper divisors (24024431080986).

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

16202255665638 is a wasteful number, since it uses less digits than its factorization.

16202255665638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8339.

The product of its (nonzero) digits is 31104000, while the sum is 57.

The spelling of 16202255665638 in words is "sixteen trillion, two hundred two billion, two hundred fifty-five million, six hundred sixty-five thousand, six hundred thirty-eight".