1644275537696 has 24 divisors (see below), whose sum is σ = 3531455416944. Its totient is φ = 747397971520.

The previous prime is 1644275537693. The next prime is 1644275537711. The reversal of 1644275537696 is 6967355724461.

It is a happy number.

It is a super-3 number, since 3×1644275537696³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1644275537693) 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 3 ways as a sum of consecutive naturals, for example, 2335618310 + ... + 2335619013.

It is an arithmetic number, because the mean of its divisors is an integer number (147143975706).

Almost surely, 2^{1644275537696} is an apocalyptic number.

1644275537696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1644275537696 is an abundant number, since it is smaller than the sum of its proper divisors (1887179879248).

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

1644275537696 is a wasteful number, since it uses less digits than its factorization.

1644275537696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671237344 (or 4671237336 counting only the distinct ones).

The product of its digits is 228614400, while the sum is 65.

The spelling of 1644275537696 in words is "one trillion, six hundred forty-four billion, two hundred seventy-five million, five hundred thirty-seven thousand, six hundred ninety-six".