18285744647 has 8 divisors (see below), whose sum is σ = 19395087360. Its totient is φ = 17191095480.

The previous prime is 18285744643. The next prime is 18285744649. The reversal of 18285744647 is 74644758281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18285744647 - 2² = 18285744643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18285744592 and 18285744601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18285744643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3670823 + ... + 3675800.

It is an arithmetic number, because the mean of its divisors is an integer number (2424385920).

Almost surely, 2^18285744647 is an apocalyptic number.

18285744647 is a deficient number, since it is larger than the sum of its proper divisors (1109342713).

18285744647 is a wasteful number, since it uses less digits than its factorization.

18285744647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7346773.

The product of its digits is 12042240, while the sum is 56.

It can be divided in two parts, 1828 and 5744647, that added together give a palindrome (5746475).

The spelling of 18285744647 in words is "eighteen billion, two hundred eighty-five million, seven hundred forty-four thousand, six hundred forty-seven".