65050550555021 has 2 divisors, whose sum is σ = 65050550555022. Its totient is φ = 65050550555020.

The previous prime is 65050550554987. The next prime is 65050550555077. The reversal of 65050550555021 is 12055505505056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52987640706121 + 12062909848900 = 7279261^2 + 3473170^2 .

It is a cyclic number.

It is not a de Polignac number, because 65050550555021 - 2¹⁰ = 65050550553997 is a prime.

It is a super-2 number, since 2×65050550555021² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65050550555621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32525275277510 + 32525275277511.

It is an arithmetic number, because the mean of its divisors is an integer number (32525275277511).

Almost surely, 2^{65050550555021} is an apocalyptic number.

It is an amenable number.

65050550555021 is a deficient number, since it is larger than the sum of its proper divisors (1).

65050550555021 is an equidigital number, since it uses as much as digits as its factorization.

65050550555021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 937500, while the sum is 44.

The spelling of 65050550555021 in words is "sixty-five trillion, fifty billion, five hundred fifty million, five hundred fifty-five thousand, twenty-one".