19819998018396 has 36 divisors (see below), whose sum is σ = 50147770766184. Its totient is φ = 6600439164000.

The previous prime is 19819998018389. The next prime is 19819998018419. The reversal of 19819998018396 is 69381089991891.

19819998018396 is a `hidden beast` number, since 1 + 98 + 199 + 9 + 80 + 183 + 96 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259413030 + ... + 259489421.

It is an arithmetic number, because the mean of its divisors is an integer number (1392993632394).

Almost surely, 2^{19819998018396} is an apocalyptic number.

It is an amenable number.

19819998018396 is an abundant number, since it is smaller than the sum of its proper divisors (30327772747788).

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

19819998018396 is a wasteful number, since it uses less digits than its factorization.

19819998018396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518903522 (or 518903517 counting only the distinct ones).

The product of its (nonzero) digits is 544195584, while the sum is 81.

The spelling of 19819998018396 in words is "nineteen trillion, eight hundred nineteen billion, nine hundred ninety-eight million, eighteen thousand, three hundred ninety-six".