16866133638 has 32 divisors (see below), whose sum is σ = 35002927872. Its totient is φ = 5413951200.

The previous prime is 16866133631. The next prime is 16866133667. The reversal of 16866133638 is 83633166861.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16866133631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442053 + ... + 478688.

It is an arithmetic number, because the mean of its divisors is an integer number (1093841496).

Almost surely, 2^16866133638 is an apocalyptic number.

16866133638 is an abundant number, since it is smaller than the sum of its proper divisors (18136794234).

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

16866133638 is a wasteful number, since it uses less digits than its factorization.

16866133638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920860.

The product of its digits is 2239488, while the sum is 51.

The spelling of 16866133638 in words is "sixteen billion, eight hundred sixty-six million, one hundred thirty-three thousand, six hundred thirty-eight".