18312646947 has 16 divisors (see below), whose sum is σ = 28362446592. Its totient is φ = 10292821920.

The previous prime is 18312646909. The next prime is 18312646949. The reversal of 18312646947 is 74964621381.

It is a happy number.

It is not a de Polignac number, because 18312646947 - 2¹¹ = 18312644899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18312646947.

It is not an unprimeable number, because it can be changed into a prime (18312646949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7146513 + ... + 7149074.

It is an arithmetic number, because the mean of its divisors is an integer number (1772652912).

Almost surely, 2^18312646947 is an apocalyptic number.

18312646947 is a deficient number, since it is larger than the sum of its proper divisors (10049799645).

18312646947 is a wasteful number, since it uses less digits than its factorization.

18312646947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14295658.

The product of its digits is 1741824, while the sum is 51.

The spelling of 18312646947 in words is "eighteen billion, three hundred twelve million, six hundred forty-six thousand, nine hundred forty-seven".