625438227461 has 2 divisors, whose sum is σ = 625438227462. Its totient is φ = 625438227460.

The previous prime is 625438227443. The next prime is 625438227571. The reversal of 625438227461 is 164722834526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392776704961 + 232661522500 = 626719^2 + 482350^2 .

It is a cyclic number.

It is not a de Polignac number, because 625438227461 - 2¹⁰ = 625438226437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625438227431) 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, 312719113730 + 312719113731.

It is an arithmetic number, because the mean of its divisors is an integer number (312719113731).

Almost surely, 2^625438227461 is an apocalyptic number.

It is an amenable number.

625438227461 is a deficient number, since it is larger than the sum of its proper divisors (1).

625438227461 is an equidigital number, since it uses as much as digits as its factorization.

625438227461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 50.

The spelling of 625438227461 in words is "six hundred twenty-five billion, four hundred thirty-eight million, two hundred twenty-seven thousand, four hundred sixty-one".