18973391006 has 4 divisors (see below), whose sum is σ = 28460086512. Its totient is φ = 9486695502.

The previous prime is 18973390967. The next prime is 18973391011. The reversal of 18973391006 is 60019337981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4743347750 + ... + 4743347753.

It is an arithmetic number, because the mean of its divisors is an integer number (7115021628).

Almost surely, 2^18973391006 is an apocalyptic number.

18973391006 is a deficient number, since it is larger than the sum of its proper divisors (9486695506).

18973391006 is an equidigital number, since it uses as much as digits as its factorization.

18973391006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486695505.

The product of its (nonzero) digits is 244944, while the sum is 47.

The spelling of 18973391006 in words is "eighteen billion, nine hundred seventy-three million, three hundred ninety-one thousand, six".