665948825 has 12 divisors (see below), whose sum is σ = 826925868. Its totient is φ = 532017600.

The previous prime is 665948809. The next prime is 665948827. The reversal of 665948825 is 528849566.

665948825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 68244121 + 597704704 = 8261^2 + 24448^2 .

It is not a de Polignac number, because 665948825 - 2⁴ = 665948809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665948827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155 + ... + 36495.

It is an arithmetic number, because the mean of its divisors is an integer number (68910489).

Almost surely, 2^665948825 is an apocalyptic number.

It is an amenable number.

665948825 is a deficient number, since it is larger than the sum of its proper divisors (160977043).

665948825 is a wasteful number, since it uses less digits than its factorization.

665948825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37084 (or 37079 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 53.

The square root of 665948825 is about 25805.9842865952. The cubic root of 665948825 is about 873.2668059023.

The spelling of 665948825 in words is "six hundred sixty-five million, nine hundred forty-eight thousand, eight hundred twenty-five".