644450093349 has 4 divisors (see below), whose sum is σ = 859266791136. Its totient is φ = 429633395564.

The previous prime is 644450093333. The next prime is 644450093389. The reversal of 644450093349 is 943390054446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 644450093349 - 2⁴ = 644450093333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644450093389) 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, 107408348889 + ... + 107408348894.

It is an arithmetic number, because the mean of its divisors is an integer number (214816697784).

Almost surely, 2^644450093349 is an apocalyptic number.

It is an amenable number.

644450093349 is a deficient number, since it is larger than the sum of its proper divisors (214816697787).

644450093349 is a wasteful number, since it uses less digits than its factorization.

644450093349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214816697786.

The product of its (nonzero) digits is 5598720, while the sum is 51.

The spelling of 644450093349 in words is "six hundred forty-four billion, four hundred fifty million, ninety-three thousand, three hundred forty-nine".