6425 has 6 divisors (see below), whose sum is σ = 7998. Its totient is φ = 5120.

The previous prime is 6421. The next prime is 6427. The reversal of 6425 is 5246.

6425 = T₉ + T₁₀ + ... + T₃₃.

6425 is nontrivially palindromic in base 4.

6425 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 3 ways, for example, as 1936 + 4489 = 44^2 + 67^2 .

It is not a de Polignac number, because 6425 - 2² = 6421 is a prime.

It is a magnanimous number.

It is a Duffinian number.

6425 is an undulating number in base 16.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104 + ... + 153.

It is an arithmetic number, because the mean of its divisors is an integer number (1333).

2⁶⁴²⁵ is an apocalyptic number.

It is an amenable number.

6425 is a deficient number, since it is larger than the sum of its proper divisors (1573).

6425 is a wasteful number, since it uses less digits than its factorization.

6425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 262 counting only the distinct ones).

The product of its digits is 240, while the sum is 17.

The square root of 6425 is about 80.1560977094. The cubic root of 6425 is about 18.5904988666.

It can be divided in two parts, 64 and 25, that multiplied together give a square (1600 = 40²).

The spelling of 6425 in words is "six thousand, four hundred twenty-five".