19639858056 has 512 divisors, whose sum is σ = 67698892800. Its totient is φ = 4598415360.

The previous prime is 19639858037. The next prime is 19639858061. The reversal of 19639858056 is 65085893691.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 93079791 + ... + 93080001.

It is an arithmetic number, because the mean of its divisors is an integer number (132224400).

Almost surely, 2^19639858056 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 19639858056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33849446400).

19639858056 is an abundant number, since it is smaller than the sum of its proper divisors (48059034744).

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

19639858056 is a wasteful number, since it uses less digits than its factorization.

19639858056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 60.

The spelling of 19639858056 in words is "nineteen billion, six hundred thirty-nine million, eight hundred fifty-eight thousand, fifty-six".