19538857013 has 4 divisors (see below), whose sum is σ = 21041846028. Its totient is φ = 18035868000.

The previous prime is 19538857001. The next prime is 19538857031. The reversal of 19538857013 is 31075883591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2399334289 + 17139522724 = 48983^2 + 130918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19538857013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19538857313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751494488 + ... + 751494513.

It is an arithmetic number, because the mean of its divisors is an integer number (5260461507).

Almost surely, 2^19538857013 is an apocalyptic number.

19538857013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19538857013 is a deficient number, since it is larger than the sum of its proper divisors (1502989015).

19538857013 is a wasteful number, since it uses less digits than its factorization.

19538857013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502989014.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 19538857013 in words is "nineteen billion, five hundred thirty-eight million, eight hundred fifty-seven thousand, thirteen".