1644165233140 has 24 divisors (see below), whose sum is σ = 3474739015272. Its totient is φ = 653477136000.

The previous prime is 1644165233131. The next prime is 1644165233159. The reversal of 1644165233140 is 413325614461.

It can be written as a sum of positive squares in 4 ways, for example, as 163820943504 + 1480344289636 = 404748^2 + 1216694^2 .

It is a super-3 number, since 3×1644165233140³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1644165233093 and 1644165233102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261806611 + ... + 261812890.

It is an arithmetic number, because the mean of its divisors is an integer number (144780792303).

Almost surely, 2^{1644165233140} is an apocalyptic number.

1644165233140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1644165233140 is an abundant number, since it is smaller than the sum of its proper divisors (1830573782132).

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

1644165233140 is a wasteful number, since it uses less digits than its factorization.

1644165233140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523619667 (or 523619665 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 1644165233140 in words is "one trillion, six hundred forty-four billion, one hundred sixty-five million, two hundred thirty-three thousand, one hundred forty".