646245125 has 8 divisors (see below), whose sum is σ = 806514072. Its totient is φ = 516996000.

The previous prime is 646245101. The next prime is 646245143. The reversal of 646245125 is 521542646.

It can be written as a sum of positive squares in 4 ways, for example, as 74891716 + 571353409 = 8654^2 + 23903^2 .

It is not a de Polignac number, because 646245125 - 2¹⁰ = 646244101 is a prime.

It is a super-3 number, since 3×646245125³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2584856 + ... + 2585105.

It is an arithmetic number, because the mean of its divisors is an integer number (100814259).

Almost surely, 2^646245125 is an apocalyptic number.

It is an amenable number.

646245125 is a deficient number, since it is larger than the sum of its proper divisors (160268947).

646245125 is an equidigital number, since it uses as much as digits as its factorization.

646245125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5169976 (or 5169966 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 646245125 is about 25421.3517539882. The cubic root of 646245125 is about 864.5678730804.

The spelling of 646245125 in words is "six hundred forty-six million, two hundred forty-five thousand, one hundred twenty-five".