6646425 has 24 divisors (see below), whose sum is σ = 11469504. Its totient is φ = 3389760.

The previous prime is 6646417. The next prime is 6646427. The reversal of 6646425 is 5246466.

It is not a de Polignac number, because 6646425 - 2³ = 6646417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6646427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (477896).

Almost surely, 2^6646425 is an apocalyptic number.

It is an amenable number.

6646425 is a deficient number, since it is larger than the sum of its proper divisors (4823079).

6646425 is a wasteful number, since it uses less digits than its factorization.

6646425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3889 (or 3884 counting only the distinct ones).

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

The square root of 6646425 is about 2578.0661356916. The cubic root of 6646425 is about 188.0165312912.

It can be divided in two parts, 66 and 46425, that multiplied together give a triangular number (3064050 = T₂₄₇₅).

The spelling of 6646425 in words is "six million, six hundred forty-six thousand, four hundred twenty-five".