646706225 has 24 divisors (see below), whose sum is σ = 881753088. Its totient is φ = 466603200.

The previous prime is 646706219. The next prime is 646706233. The reversal of 646706225 is 522607646.

646706225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646706225 - 2¹⁰ = 646705201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25667 + ... + 44183.

It is an arithmetic number, because the mean of its divisors is an integer number (36739712).

Almost surely, 2^646706225 is an apocalyptic number.

It is an amenable number.

646706225 is a deficient number, since it is larger than the sum of its proper divisors (235046863).

646706225 is a wasteful number, since it uses less digits than its factorization.

646706225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18665 (or 18660 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 646706225 is about 25430.4192847857. The cubic root of 646706225 is about 864.7734490839.

The spelling of 646706225 in words is "six hundred forty-six million, seven hundred six thousand, two hundred twenty-five".