65405621273 has 2 divisors, whose sum is σ = 65405621274. Its totient is φ = 65405621272.

The previous prime is 65405621233. The next prime is 65405621291. The reversal of 65405621273 is 37212650456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55334093824 + 10071527449 = 235232^2 + 100357^2 .

It is a cyclic number.

It is not a de Polignac number, because 65405621273 - 2³⁰ = 64331879449 is a prime.

It is a super-2 number, since 2×65405621273² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65405621273.

It is not a weakly prime, because it can be changed into another prime (65405621233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32702810636 + 32702810637.

It is an arithmetic number, because the mean of its divisors is an integer number (32702810637).

Almost surely, 2^65405621273 is an apocalyptic number.

It is an amenable number.

65405621273 is a deficient number, since it is larger than the sum of its proper divisors (1).

65405621273 is an equidigital number, since it uses as much as digits as its factorization.

65405621273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 65405621273 in words is "sixty-five billion, four hundred five million, six hundred twenty-one thousand, two hundred seventy-three".