6618725 has 6 divisors (see below), whose sum is σ = 8207250. Its totient is φ = 5294960.

The previous prime is 6618713. The next prime is 6618727. The reversal of 6618725 is 5278166.

It can be written as a sum of positive squares in 3 ways, for example, as 708964 + 5909761 = 842^2 + 2431^2 .

It is not a de Polignac number, because 6618725 - 2¹⁰ = 6617701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618727) 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, 132350 + ... + 132399.

It is an arithmetic number, because the mean of its divisors is an integer number (1367875).

Almost surely, 2^6618725 is an apocalyptic number.

It is an amenable number.

6618725 is a deficient number, since it is larger than the sum of its proper divisors (1588525).

6618725 is a wasteful number, since it uses less digits than its factorization.

6618725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264759 (or 264754 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 6618725 is about 2572.6882827113. The cubic root of 6618725 is about 187.7549716385.

The spelling of 6618725 in words is "six million, six hundred eighteen thousand, seven hundred twenty-five".