1644350534461 has 4 divisors (see below), whose sum is σ = 1660631232924. Its totient is φ = 1628069836000.

The previous prime is 1644350534441. The next prime is 1644350534471.

1644350534461 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1391762872900 + 252587661561 = 1179730^2 + 502581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1644350534461 - 2²⁹ = 1643813663549 is a prime.

It is a super-3 number, since 3×1644350534461³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644350534441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8140349080 + ... + 8140349281.

It is an arithmetic number, because the mean of its divisors is an integer number (415157808231).

Almost surely, 2^{1644350534461} is an apocalyptic number.

It is an amenable number.

1644350534461 is a deficient number, since it is larger than the sum of its proper divisors (16280698463).

1644350534461 is a wasteful number, since it uses less digits than its factorization.

1644350534461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16280698462.

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 1644350534461 in words is "one trillion, six hundred forty-four billion, three hundred fifty million, five hundred thirty-four thousand, four hundred sixty-one".