1644312773363 has 4 divisors (see below), whose sum is σ = 1770798371328. Its totient is φ = 1517827175400.

The previous prime is 1644312773321. The next prime is 1644312773387. The reversal of 1644312773363 is 3633772134461.

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

It is a cyclic number.

It is not a de Polignac number, because 1644312773363 - 2²⁸ = 1644044337907 is a prime.

It is a super-3 number, since 3×1644312773363³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1644312773063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63242798963 + ... + 63242798988.

It is an arithmetic number, because the mean of its divisors is an integer number (442699592832).

Almost surely, 2^{1644312773363} is an apocalyptic number.

1644312773363 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1644312773363 is a deficient number, since it is larger than the sum of its proper divisors (126485597965).

1644312773363 is a wasteful number, since it uses less digits than its factorization.

1644312773363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126485597964.

The product of its digits is 4572288, while the sum is 50.

The spelling of 1644312773363 in words is "one trillion, six hundred forty-four billion, three hundred twelve million, seven hundred seventy-three thousand, three hundred sixty-three".