19803621818364 has 48 divisors (see below), whose sum is σ = 49359573855648. Its totient is φ = 6157919531008.

The previous prime is 19803621818293. The next prime is 19803621818377. The reversal of 19803621818364 is 46381812630891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19803621818298 and 19803621818307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429519327 + ... + 429565430.

It is an arithmetic number, because the mean of its divisors is an integer number (1028324455326).

Almost surely, 2^{19803621818364} is an apocalyptic number.

It is an amenable number.

19803621818364 is an abundant number, since it is smaller than the sum of its proper divisors (29555952037284).

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

19803621818364 is a wasteful number, since it uses less digits than its factorization.

19803621818364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859084894 (or 859084892 counting only the distinct ones).

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

The spelling of 19803621818364 in words is "nineteen trillion, eight hundred three billion, six hundred twenty-one million, eight hundred eighteen thousand, three hundred sixty-four".