1644165233131 has 2 divisors, whose sum is σ = 1644165233132. Its totient is φ = 1644165233130.

The previous prime is 1644165233129. The next prime is 1644165233159. The reversal of 1644165233131 is 1313325614461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1644165233131 - 2¹ = 1644165233129 is a prime.

It is a super-3 number, since 3×1644165233131³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1644165233129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1644165230131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822082616565 + 822082616566.

It is an arithmetic number, because the mean of its divisors is an integer number (822082616566).

Almost surely, 2^{1644165233131} is an apocalyptic number.

1644165233131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644165233131 is an equidigital number, since it uses as much as digits as its factorization.

1644165233131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The spelling of 1644165233131 in words is "one trillion, six hundred forty-four billion, one hundred sixty-five million, two hundred thirty-three thousand, one hundred thirty-one".