18917192106 has 24 divisors (see below), whose sum is σ = 41010384324. Its totient is φ = 6302171520.

The previous prime is 18917192071. The next prime is 18917192137. The reversal of 18917192106 is 60129171981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18389800881 + 527391225 = 135609^2 + 22965^2 .

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, 263725 + ... + 327696.

Almost surely, 2^18917192106 is an apocalyptic number.

18917192106 is an abundant number, since it is smaller than the sum of its proper divisors (22093192218).

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

18917192106 is a wasteful number, since it uses less digits than its factorization.

18917192106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593206 (or 593203 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 45.

The spelling of 18917192106 in words is "eighteen billion, nine hundred seventeen million, one hundred ninety-two thousand, one hundred six".