1816665753798 has 144 divisors (see below), whose sum is σ = 4931814064320. Its totient is φ = 480293325792.

The previous prime is 1816665753797. The next prime is 1816665753827. The reversal of 1816665753798 is 8973575666181.

It is a super-2 number, since 2×1816665753798² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816665753797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 539940 + ... + 1981127.

It is an arithmetic number, because the mean of its divisors is an integer number (34248708780).

Almost surely, 2^{1816665753798} is an apocalyptic number.

1816665753798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1816665753798 is an abundant number, since it is smaller than the sum of its proper divisors (3115148310522).

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

1816665753798 is a wasteful number, since it uses less digits than its factorization.

1816665753798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521151 (or 2521141 counting only the distinct ones).

The product of its digits is 457228800, while the sum is 72.

The spelling of 1816665753798 in words is "one trillion, eight hundred sixteen billion, six hundred sixty-five million, seven hundred fifty-three thousand, seven hundred ninety-eight".