1644500825 has 48 divisors (see below), whose sum is σ = 2422612800. Its totient is φ = 1093881600.

The previous prime is 1644500783. The next prime is 1644500839. The reversal of 1644500825 is 5280054461.

1644500825 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1644500825 - 2¹⁴ = 1644484441 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146099 + ... + 156951.

It is an arithmetic number, because the mean of its divisors is an integer number (50471100).

Almost surely, 2^1644500825 is an apocalyptic number.

It is an amenable number.

1644500825 is a deficient number, since it is larger than the sum of its proper divisors (778111975).

1644500825 is a wasteful number, since it uses less digits than its factorization.

1644500825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10922 (or 10917 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 1644500825 is about 40552.4453639975. The cubic root of 1644500825 is about 1180.3515243515.

The spelling of 1644500825 in words is "one billion, six hundred forty-four million, five hundred thousand, eight hundred twenty-five".