18191486792 has 32 divisors (see below), whose sum is σ = 35681715000. Its totient is φ = 8683411968.

The previous prime is 18191486779. The next prime is 18191486849. The reversal of 18191486792 is 29768419181.

It can be written as a sum of positive squares in 4 ways, for example, as 16709698756 + 1481788036 = 129266^2 + 38494^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419867 + ... + 461162.

Almost surely, 2^18191486792 is an apocalyptic number.

It is an amenable number.

18191486792 is a deficient number, since it is larger than the sum of its proper divisors (17490228208).

18191486792 is a wasteful number, since it uses less digits than its factorization.

18191486792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881153 (or 881149 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 56.

The spelling of 18191486792 in words is "eighteen billion, one hundred ninety-one million, four hundred eighty-six thousand, seven hundred ninety-two".