18631216351606 has 4 divisors (see below), whose sum is σ = 27946824527412. Its totient is φ = 9315608175802.

The previous prime is 18631216351591. The next prime is 18631216351609. The reversal of 18631216351606 is 60615361213681.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18631216351606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18631216351609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4657804087900 + ... + 4657804087903.

It is an arithmetic number, because the mean of its divisors is an integer number (6986706131853).

Almost surely, 2^{18631216351606} is an apocalyptic number.

18631216351606 is a deficient number, since it is larger than the sum of its proper divisors (9315608175806).

18631216351606 is an equidigital number, since it uses as much as digits as its factorization.

18631216351606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9315608175805.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 18631216351606 in words is "eighteen trillion, six hundred thirty-one billion, two hundred sixteen million, three hundred fifty-one thousand, six hundred six".