1644244350899 has 2 divisors, whose sum is σ = 1644244350900. Its totient is φ = 1644244350898.

The previous prime is 1644244350857. The next prime is 1644244350901. The reversal of 1644244350899 is 9980534424461.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9980534424461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1644244350899 - 2⁸ = 1644244350643 is a prime.

It is a super-3 number, since 3×1644244350899³ (a number of 38 digits) contains 333 as substring.

Together with 1644244350901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1644244350829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822122175449 + 822122175450.

It is an arithmetic number, because the mean of its divisors is an integer number (822122175450).

Almost surely, 2^{1644244350899} is an apocalyptic number.

1644244350899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644244350899 is an equidigital number, since it uses as much as digits as its factorization.

1644244350899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29859840, while the sum is 59.

The spelling of 1644244350899 in words is "one trillion, six hundred forty-four billion, two hundred forty-four million, three hundred fifty thousand, eight hundred ninety-nine".