644223504216105 has 48 divisors (see below), whose sum is σ = 1218385966112640. Its totient is φ = 312294921868800.

The previous prime is 644223504216077. The next prime is 644223504216121. The reversal of 644223504216105 is 501612405322446.

It is a happy number.

644223504216105 is a `hidden beast` number, since 6 + 4 + 4 + 2 + 2 + 3 + 5 + 0 + 4 + 21 + 610 + 5 = 666.

It is not a de Polignac number, because 644223504216105 - 2²⁶ = 644223437107241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113621440 + ... + 119156529.

It is an arithmetic number, because the mean of its divisors is an integer number (25383040960680).

Almost surely, 2^{644223504216105} is an apocalyptic number.

It is an amenable number.

644223504216105 is a deficient number, since it is larger than the sum of its proper divisors (574162461896535).

644223504216105 is a wasteful number, since it uses less digits than its factorization.

644223504216105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232783582 (or 232783579 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 644223504216105 in words is "six hundred forty-four trillion, two hundred twenty-three billion, five hundred four million, two hundred sixteen thousand, one hundred five".