646321425 has 24 divisors (see below), whose sum is σ = 1069369056. Its totient is φ = 344451840.

The previous prime is 646321399. The next prime is 646321441. The reversal of 646321425 is 524123646.

It is not a de Polignac number, because 646321425 - 2¹⁴ = 646305041 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146857 + ... + 151193.

It is an arithmetic number, because the mean of its divisors is an integer number (44557044).

Almost surely, 2^646321425 is an apocalyptic number.

It is an amenable number.

646321425 is a deficient number, since it is larger than the sum of its proper divisors (423047631).

646321425 is a wasteful number, since it uses less digits than its factorization.

646321425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6337 (or 6332 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 646321425 is about 25422.8524166743. The cubic root of 646321425 is about 864.6018972869.

The spelling of 646321425 in words is "six hundred forty-six million, three hundred twenty-one thousand, four hundred twenty-five".