19629865421826 has 128 divisors (see below), whose sum is σ = 44227673588736. Its totient is φ = 5756734126080.

The previous prime is 19629865421797. The next prime is 19629865421953. The reversal of 19629865421826 is 62812456892691.

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, 1137492990 + ... + 1137510246.

It is an arithmetic number, because the mean of its divisors is an integer number (345528699912).

Almost surely, 2^{19629865421826} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19629865421826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22113836794368).

19629865421826 is an abundant number, since it is smaller than the sum of its proper divisors (24597808166910).

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

19629865421826 is a wasteful number, since it uses less digits than its factorization.

19629865421826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20976.

The product of its digits is 179159040, while the sum is 69.

The spelling of 19629865421826 in words is "nineteen trillion, six hundred twenty-nine billion, eight hundred sixty-five million, four hundred twenty-one thousand, eight hundred twenty-six".