19091090920194 has 24 divisors (see below), whose sum is σ = 41364771193980. Its totient is φ = 6363582993888.

The previous prime is 19091090920147. The next prime is 19091090920283. The reversal of 19091090920194 is 49102909019091.

It can be written as a sum of positive squares in 2 ways, for example, as 18450590022225 + 640500897969 = 4295415^2 + 800313^2 .

It is a super-2 number, since 2×19091090920194² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19091090920194.

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, 8462349 + ... + 10478240.

Almost surely, 2^{19091090920194} is an apocalyptic number.

19091090920194 is an abundant number, since it is smaller than the sum of its proper divisors (22273680273786).

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

19091090920194 is a wasteful number, since it uses less digits than its factorization.

19091090920194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18996594 (or 18996591 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The spelling of 19091090920194 in words is "nineteen trillion, ninety-one billion, ninety million, nine hundred twenty thousand, one hundred ninety-four".