225421161257 has 2 divisors, whose sum is σ = 225421161258. Its totient is φ = 225421161256.

The previous prime is 225421161211. The next prime is 225421161269. The reversal of 225421161257 is 752161124522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225103751401 + 317409856 = 474451^2 + 17816^2 .

It is a cyclic number.

It is not a de Polignac number, because 225421161257 - 2⁸ = 225421161001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225421161257.

It is not a weakly prime, because it can be changed into another prime (225421169257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112710580628 + 112710580629.

It is an arithmetic number, because the mean of its divisors is an integer number (112710580629).

Almost surely, 2^225421161257 is an apocalyptic number.

It is an amenable number.

225421161257 is a deficient number, since it is larger than the sum of its proper divisors (1).

225421161257 is an equidigital number, since it uses as much as digits as its factorization.

225421161257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

Adding to 225421161257 its reverse (752161124522), we get a palindrome (977582285779).

The spelling of 225421161257 in words is "two hundred twenty-five billion, four hundred twenty-one million, one hundred sixty-one thousand, two hundred fifty-seven".