1663232718173 has 16 divisors (see below), whose sum is σ = 1802620577520. Its totient is φ = 1534568974848.

The previous prime is 1663232718157. The next prime is 1663232718193. The reversal of 1663232718173 is 3718172323661.

It can be written as a sum of positive squares in 8 ways, for example, as 1641788630329 + 21444087844 = 1281323^2 + 146438^2 .

It is not a de Polignac number, because 1663232718173 - 2⁴ = 1663232718157 is a prime.

It is a super-2 number, since 2×1663232718173² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663232718193) 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, 4517861 + ... + 4872117.

It is an arithmetic number, because the mean of its divisors is an integer number (112663786095).

Almost surely, 2^{1663232718173} is an apocalyptic number.

1663232718173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1663232718173 is a deficient number, since it is larger than the sum of its proper divisors (139387859347).

1663232718173 is an equidigital number, since it uses as much as digits as its factorization.

1663232718173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356433 (or 356407 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 50.

The spelling of 1663232718173 in words is "one trillion, six hundred sixty-three billion, two hundred thirty-two million, seven hundred eighteen thousand, one hundred seventy-three".