625144415221 has 2 divisors, whose sum is σ = 625144415222. Its totient is φ = 625144415220.

The previous prime is 625144415213. The next prime is 625144415257. The reversal of 625144415221 is 122514441526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526366211121 + 98778204100 = 725511^2 + 314290^2 .

It is a cyclic number.

It is not a de Polignac number, because 625144415221 - 2³ = 625144415213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625144413221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312572207610 + 312572207611.

It is an arithmetic number, because the mean of its divisors is an integer number (312572207611).

Almost surely, 2^625144415221 is an apocalyptic number.

It is an amenable number.

625144415221 is a deficient number, since it is larger than the sum of its proper divisors (1).

625144415221 is an equidigital number, since it uses as much as digits as its factorization.

625144415221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76800, while the sum is 37.

Adding to 625144415221 its reverse (122514441526), we get a palindrome (747658856747).

The spelling of 625144415221 in words is "six hundred twenty-five billion, one hundred forty-four million, four hundred fifteen thousand, two hundred twenty-one".