1665326955318 has 128 divisors (see below), whose sum is σ = 3826709913600. Its totient is φ = 478883912832.

The previous prime is 1665326955311. The next prime is 1665326955349. The reversal of 1665326955318 is 8135596235661.

It is a super-2 number, since 2×1665326955318² (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 (1665326955311) 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 63 ways as a sum of consecutive naturals, for example, 153015505 + ... + 153026387.

It is an arithmetic number, because the mean of its divisors is an integer number (29896171200).

Almost surely, 2^{1665326955318} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665326955318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1913354956800).

1665326955318 is an abundant number, since it is smaller than the sum of its proper divisors (2161382958282).

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

1665326955318 is a wasteful number, since it uses less digits than its factorization.

1665326955318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12306.

The product of its digits is 34992000, while the sum is 60.

The spelling of 1665326955318 in words is "one trillion, six hundred sixty-five billion, three hundred twenty-six million, nine hundred fifty-five thousand, three hundred eighteen".