657212225 has 12 divisors (see below), whose sum is σ = 815666544. Its totient is φ = 525303120.

The previous prime is 657212221. The next prime is 657212263. The reversal of 657212225 is 522212756.

It is not a de Polignac number, because 657212225 - 2² = 657212221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 657212191 and 657212200.

It is not an unprimeable number, because it can be changed into a prime (657212221) 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, 18602 + ... + 40748.

It is an arithmetic number, because the mean of its divisors is an integer number (67972212).

Almost surely, 2^657212225 is an apocalyptic number.

It is an amenable number.

657212225 is a deficient number, since it is larger than the sum of its proper divisors (158454319).

657212225 is a wasteful number, since it uses less digits than its factorization.

657212225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23344 (or 23339 counting only the distinct ones).

The product of its digits is 16800, while the sum is 32.

The square root of 657212225 is about 25636.1507446028. The cubic root of 657212225 is about 869.4311801219.

The spelling of 657212225 in words is "six hundred fifty-seven million, two hundred twelve thousand, two hundred twenty-five".