19810106913 has 16 divisors (see below), whose sum is σ = 26886475520. Its totient is φ = 12971971584.

The previous prime is 19810106909. The next prime is 19810106929. The reversal of 19810106913 is 31960101891.

It is not a de Polignac number, because 19810106913 - 2² = 19810106909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19810106903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170806 + ... + 262287.

It is an arithmetic number, because the mean of its divisors is an integer number (1680404720).

Almost surely, 2^19810106913 is an apocalyptic number.

It is an amenable number.

19810106913 is a deficient number, since it is larger than the sum of its proper divisors (7076368607).

19810106913 is a wasteful number, since it uses less digits than its factorization.

19810106913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433368.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 19810106913 in words is "nineteen billion, eight hundred ten million, one hundred six thousand, nine hundred thirteen".