42318661225 has 9 divisors (see below), whose sum is σ = 52476415383. Its totient is φ = 33854106120.

The previous prime is 42318661201. The next prime is 42318661261. The reversal of 42318661225 is 52216681324.

The square root of 42318661225 is 205715.

It is a perfect power (a square), and thus also a powerful number.

42318661225 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 only one way, i.e., 15234718041 + 27083943184 = 123429^2 + 164572^2 .

It is not a de Polignac number, because 42318661225 - 2⁷ = 42318661097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1008004 + ... + 1049146.

Almost surely, 2^42318661225 is an apocalyptic number.

42318661225 is the 205715-th square number.

42318661225 is the 102858-th centered octagonal number.

It is an amenable number.

42318661225 is a deficient number, since it is larger than the sum of its proper divisors (10157754158).

42318661225 is an frugal number, since it uses more digits than its factorization.

42318661225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82296 (or 41148 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The spelling of 42318661225 in words is "forty-two billion, three hundred eighteen million, six hundred sixty-one thousand, two hundred twenty-five".