644105501446 has 16 divisors (see below), whose sum is σ = 1054003888080. Its totient is φ = 292771598080.

The previous prime is 644105501411. The next prime is 644105501461.

It is a happy number.

644105501446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644105501399 and 644105501408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2540490 + ... + 2782498.

It is an arithmetic number, because the mean of its divisors is an integer number (65875243005).

Almost surely, 2^644105501446 is an apocalyptic number.

644105501446 is a deficient number, since it is larger than the sum of its proper divisors (409898386634).

644105501446 is a wasteful number, since it uses less digits than its factorization.

644105501446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362999.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 644105501446 in words is "six hundred forty-four billion, one hundred five million, five hundred one thousand, four hundred forty-six".