506561625391 has 2 divisors, whose sum is σ = 506561625392. Its totient is φ = 506561625390.

The previous prime is 506561625389. The next prime is 506561625421. The reversal of 506561625391 is 193526165605.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 506561625391 - 2¹ = 506561625389 is a prime.

Together with 506561625389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (506561625301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253280812695 + 253280812696.

It is an arithmetic number, because the mean of its divisors is an integer number (253280812696).

Almost surely, 2^506561625391 is an apocalyptic number.

506561625391 is a deficient number, since it is larger than the sum of its proper divisors (1).

506561625391 is an equidigital number, since it uses as much as digits as its factorization.

506561625391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The spelling of 506561625391 in words is "five hundred six billion, five hundred sixty-one million, six hundred twenty-five thousand, three hundred ninety-one".