1805817646164 has 24 divisors (see below), whose sum is σ = 4815513723328. Its totient is φ = 515947898880.

The previous prime is 1805817646141. The next prime is 1805817646183. The reversal of 1805817646164 is 4616467185081.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10748914477 + ... + 10748914644.

Almost surely, 2^{1805817646164} is an apocalyptic number.

1805817646164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1805817646164 is an abundant number, since it is smaller than the sum of its proper divisors (3009696077164).

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

1805817646164 is a wasteful number, since it uses less digits than its factorization.

1805817646164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21497829135 (or 21497829133 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 1805817646164 in words is "one trillion, eight hundred five billion, eight hundred seventeen million, six hundred forty-six thousand, one hundred sixty-four".