1789820648018 has 54 divisors (see below), whose sum is σ = 2965180890861. Its totient is φ = 809894519616.

The previous prime is 1789820647987. The next prime is 1789820648023. The reversal of 1789820648018 is 8108460289871.

It can be written as a sum of positive squares in 14 ways, for example, as 435094586689 + 1354726061329 = 659617^2 + 1163927^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=945997.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1303583180 + ... + 1303584552.

Almost surely, 2^{1789820648018} is an apocalyptic number.

1789820648018 is a deficient number, since it is larger than the sum of its proper divisors (1175360242843).

1789820648018 is an frugal number, since it uses more digits than its factorization.

1789820648018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880 (or 1441 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 62.

The spelling of 1789820648018 in words is "one trillion, seven hundred eighty-nine billion, eight hundred twenty million, six hundred forty-eight thousand, eighteen".