19194116069881 has 27 divisors (see below), whose sum is σ = 20174544632431. Its totient is φ = 18259831432304.

The previous prime is 19194116069861. The next prime is 19194116069899. The reversal of 19194116069881 is 18896061149191.

It is a happy number.

The square root of 19194116069881 is 4381109.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9307594197225 + 9886521872656 = 3050835^2 + 3144284^2 .

It is not a de Polignac number, because 19194116069881 - 2²⁵ = 19194082515449 is a prime.

It is a super-2 number, since 2×19194116069881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19194116069861) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 24082955775 + ... + 24082956571.

Almost surely, 2^{19194116069881} is an apocalyptic number.

19194116069881 is the 4381109-th square number.

19194116069881 is the 2190555-th centered octagonal number.

It is an amenable number.

19194116069881 is a deficient number, since it is larger than the sum of its proper divisors (980428562550).

19194116069881 is an frugal number, since it uses more digits than its factorization.

19194116069881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 64.

The spelling of 19194116069881 in words is "nineteen trillion, one hundred ninety-four billion, one hundred sixteen million, sixty-nine thousand, eight hundred eighty-one".