1649418673218 has 16 divisors (see below), whose sum is σ = 3298915952640. Its totient is φ = 549793123376.

The previous prime is 1649418673213. The next prime is 1649418673237. The reversal of 1649418673218 is 8123768149461.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1649418673213) 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, 3000705 + ... + 3507572.

It is an arithmetic number, because the mean of its divisors is an integer number (206182247040).

Almost surely, 2^{1649418673218} is an apocalyptic number.

1649418673218 is an abundant number, since it is smaller than the sum of its proper divisors (1649497279422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1649418673218 is a wasteful number, since it uses less digits than its factorization.

1649418673218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6550521.

The product of its digits is 13934592, while the sum is 60.

The spelling of 1649418673218 in words is "one trillion, six hundred forty-nine billion, four hundred eighteen million, six hundred seventy-three thousand, two hundred eighteen".