19539965952 has 144 divisors (see below), whose sum is σ = 60776908920. Its totient is φ = 6012223488.

The previous prime is 19539965933. The next prime is 19539965957. The reversal of 19539965952 is 25956993591.

19539965952 is a `hidden beast` number, since 1 + 9 + 5 + 39 + 9 + 6 + 595 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-4 number, since 4×19539965952⁴ (a number of 42 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19539965952.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19539965957) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 198843 + ... + 280389.

Almost surely, 2^19539965952 is an apocalyptic number.

19539965952 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 19539965952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30388454460).

19539965952 is an abundant number, since it is smaller than the sum of its proper divisors (41236942968).

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

19539965952 is a wasteful number, since it uses less digits than its factorization.

19539965952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81588 (or 81565 counting only the distinct ones).

The product of its digits is 29524500, while the sum is 63.

The spelling of 19539965952 in words is "nineteen billion, five hundred thirty-nine million, nine hundred sixty-five thousand, nine hundred fifty-two".