51065633639 has 2 divisors, whose sum is σ = 51065633640. Its totient is φ = 51065633638.

The previous prime is 51065633623. The next prime is 51065633693. The reversal of 51065633639 is 93633656015.

Together with next prime (51065633693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51065633639 - 2⁴ = 51065633623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51065633593 and 51065633602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51065633239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25532816819 + 25532816820.

It is an arithmetic number, because the mean of its divisors is an integer number (25532816820).

Almost surely, 2^51065633639 is an apocalyptic number.

51065633639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51065633639 is an equidigital number, since it uses as much as digits as its factorization.

51065633639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1312200, while the sum is 47.

The spelling of 51065633639 in words is "fifty-one billion, sixty-five million, six hundred thirty-three thousand, six hundred thirty-nine".