65510421751 has 2 divisors, whose sum is σ = 65510421752. Its totient is φ = 65510421750.

The previous prime is 65510421749. The next prime is 65510421797. The reversal of 65510421751 is 15712401556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65510421751 - 2¹ = 65510421749 is a prime.

Together with 65510421749, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 65510421751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65510421731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32755210875 + 32755210876.

It is an arithmetic number, because the mean of its divisors is an integer number (32755210876).

Almost surely, 2^65510421751 is an apocalyptic number.

65510421751 is a deficient number, since it is larger than the sum of its proper divisors (1).

65510421751 is an equidigital number, since it uses as much as digits as its factorization.

65510421751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 37.

The spelling of 65510421751 in words is "sixty-five billion, five hundred ten million, four hundred twenty-one thousand, seven hundred fifty-one".