1644240424461 has 8 divisors (see below), whose sum is σ = 2287638851520. Its totient is φ = 1048501140192.

The previous prime is 1644240424457. The next prime is 1644240424487.

1644240424461 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1644240424461 - 2² = 1644240424457 is a prime.

It is a super-3 number, since 3×1644240424461³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644240424861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11914785616 + ... + 11914785753.

It is an arithmetic number, because the mean of its divisors is an integer number (285954856440).

Almost surely, 2^{1644240424461} is an apocalyptic number.

It is an amenable number.

1644240424461 is a deficient number, since it is larger than the sum of its proper divisors (643398427059).

1644240424461 is a wasteful number, since it uses less digits than its factorization.

1644240424461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23829571395.

The product of its (nonzero) digits is 589824, while the sum is 42.

The spelling of 1644240424461 in words is "one trillion, six hundred forty-four billion, two hundred forty million, four hundred twenty-four thousand, four hundred sixty-one".