1659278323998 has 192 divisors, whose sum is σ = 4001727929472. Its totient is φ = 494220165120.

The previous prime is 1659278323993. The next prime is 1659278324009. The reversal of 1659278323998 is 8993238729561.

1659278323998 is a `hidden beast` number, since 1 + 6 + 592 + 7 + 8 + 3 + 23 + 9 + 9 + 8 = 666.

It is a super-2 number, since 2×1659278323998² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659278323993) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 933751686 + ... + 933753462.

It is an arithmetic number, because the mean of its divisors is an integer number (20842332966).

Almost surely, 2^{1659278323998} is an apocalyptic number.

1659278323998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1659278323998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2000863964736).

1659278323998 is an abundant number, since it is smaller than the sum of its proper divisors (2342449605474).

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

1659278323998 is a wasteful number, since it uses less digits than its factorization.

1659278323998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739 (or 2736 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

The spelling of 1659278323998 in words is "one trillion, six hundred fifty-nine billion, two hundred seventy-eight million, three hundred twenty-three thousand, nine hundred ninety-eight".