646625125 has 16 divisors (see below), whose sum is σ = 833025024. Its totient is φ = 500610000.

The previous prime is 646625123. The next prime is 646625137. The reversal of 646625125 is 521526646.

It is not a de Polignac number, because 646625125 - 2¹ = 646625123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646625123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79561 + ... + 87310.

It is an arithmetic number, because the mean of its divisors is an integer number (52064064).

Almost surely, 2^646625125 is an apocalyptic number.

It is an amenable number.

646625125 is a deficient number, since it is larger than the sum of its proper divisors (186399899).

646625125 is a wasteful number, since it uses less digits than its factorization.

646625125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166917 (or 166907 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 646625125 is about 25428.8246877436. The cubic root of 646625125 is about 864.7372986878.

The spelling of 646625125 in words is "six hundred forty-six million, six hundred twenty-five thousand, one hundred twenty-five".