51625628309 has 2 divisors, whose sum is σ = 51625628310. Its totient is φ = 51625628308.

The previous prime is 51625628297. The next prime is 51625628317. The reversal of 51625628309 is 90382652615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33426808900 + 18198819409 = 182830^2 + 134903^2 .

It is a cyclic number.

It is not a de Polignac number, because 51625628309 - 2¹² = 51625624213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51625628359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25812814154 + 25812814155.

It is an arithmetic number, because the mean of its divisors is an integer number (25812814155).

Almost surely, 2^51625628309 is an apocalyptic number.

It is an amenable number.

51625628309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51625628309 is an equidigital number, since it uses as much as digits as its factorization.

51625628309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 51625628309 in words is "fifty-one billion, six hundred twenty-five million, six hundred twenty-eight thousand, three hundred nine".