646425205 has 8 divisors (see below), whose sum is σ = 778512312. Its totient is φ = 515272128.

The previous prime is 646425193. The next prime is 646425271. The reversal of 646425205 is 502524646.

It can be written as a sum of positive squares in 4 ways, for example, as 1214404 + 645210801 = 1102^2 + 25401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646425205 - 2⁵ = 646425173 is a prime.

It is a Duffinian number.

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, 231982 + ... + 234751.

It is an arithmetic number, because the mean of its divisors is an integer number (97314039).

Almost surely, 2^646425205 is an apocalyptic number.

It is an amenable number.

646425205 is a deficient number, since it is larger than the sum of its proper divisors (132087107).

646425205 is a wasteful number, since it uses less digits than its factorization.

646425205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467015.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 646425205 is about 25424.8934117726. The cubic root of 646425205 is about 864.6481712611.

The spelling of 646425205 in words is "six hundred forty-six million, four hundred twenty-five thousand, two hundred five".