19655885952 has 128 divisors (see below), whose sum is σ = 58230576000. Its totient is φ = 6527296512.

The previous prime is 19655885897. The next prime is 19655885989. The reversal of 19655885952 is 25958855691.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 19655885952.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919093 + ... + 940235.

It is an arithmetic number, because the mean of its divisors is an integer number (454926375).

Almost surely, 2^19655885952 is an apocalyptic number.

19655885952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19655885952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29115288000).

19655885952 is an abundant number, since it is smaller than the sum of its proper divisors (38574690048).

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

19655885952 is a wasteful number, since it uses less digits than its factorization.

19655885952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21435 (or 21417 counting only the distinct ones).

The product of its digits is 38880000, while the sum is 63.

The spelling of 19655885952 in words is "nineteen billion, six hundred fifty-five million, eight hundred eighty-five thousand, nine hundred fifty-two".