19666528284 has 192 divisors, whose sum is σ = 53828812800. Its totient is φ = 5536657152.

The previous prime is 19666528279. The next prime is 19666528337. The reversal of 19666528284 is 48282566691.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11004439 + ... + 11006225.

It is an arithmetic number, because the mean of its divisors is an integer number (280358400).

Almost surely, 2^19666528284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19666528284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26914406400).

19666528284 is an abundant number, since it is smaller than the sum of its proper divisors (34162284516).

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

19666528284 is a wasteful number, since it uses less digits than its factorization.

19666528284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952 (or 1950 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 57.

The spelling of 19666528284 in words is "nineteen billion, six hundred sixty-six million, five hundred twenty-eight thousand, two hundred eighty-four".