1816699945593 has 16 divisors (see below), whose sum is σ = 2611149791936. Its totient is φ = 1116874198080.

The previous prime is 1816699945531. The next prime is 1816699945631. The reversal of 1816699945593 is 3955499966181.

It is not a de Polignac number, because 1816699945593 - 2³⁷ = 1679260992121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1816699965593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22772155 + ... + 22851792.

It is an arithmetic number, because the mean of its divisors is an integer number (163196861996).

Almost surely, 2^{1816699945593} is an apocalyptic number.

1816699945593 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1816699945593 is a deficient number, since it is larger than the sum of its proper divisors (794449846343).

1816699945593 is a wasteful number, since it uses less digits than its factorization.

1816699945593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45624984.

The product of its digits is 566870400, while the sum is 75.

The spelling of 1816699945593 in words is "one trillion, eight hundred sixteen billion, six hundred ninety-nine million, nine hundred forty-five thousand, five hundred ninety-three".