1644454544461 has 8 divisors (see below), whose sum is σ = 1679570928000. Its totient is φ = 1609343493888.

The previous prime is 1644454544443. The next prime is 1644454544483.

It is a happy number.

1644454544461 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644454544461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1644454544399 and 1644454544408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644454541461) 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, 706836 + ... + 1946413.

It is an arithmetic number, because the mean of its divisors is an integer number (209946366000).

Almost surely, 2^{1644454544461} is an apocalyptic number.

It is an amenable number.

1644454544461 is a deficient number, since it is larger than the sum of its proper divisors (35116383539).

1644454544461 is a wasteful number, since it uses less digits than its factorization.

1644454544461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666483.

The product of its digits is 14745600, while the sum is 52.

The spelling of 1644454544461 in words is "one trillion, six hundred forty-four billion, four hundred fifty-four million, five hundred forty-four thousand, four hundred sixty-one".