19964838408 has 16 divisors (see below), whose sum is σ = 49912096080. Its totient is φ = 6654946128.

The previous prime is 19964838371. The next prime is 19964838497. The reversal of 19964838408 is 80483846991.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415934110 + ... + 415934157.

It is an arithmetic number, because the mean of its divisors is an integer number (3119506005).

Almost surely, 2^19964838408 is an apocalyptic number.

It is an amenable number.

19964838408 is an abundant number, since it is smaller than the sum of its proper divisors (29947257672).

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

19964838408 is a wasteful number, since it uses less digits than its factorization.

19964838408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831868276 (or 831868272 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 60.

The spelling of 19964838408 in words is "nineteen billion, nine hundred sixty-four million, eight hundred thirty-eight thousand, four hundred eight".