65531225381 has 2 divisors, whose sum is σ = 65531225382. Its totient is φ = 65531225380.

The previous prime is 65531225369. The next prime is 65531225393. The reversal of 65531225381 is 18352213556.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (65531225369) and next prime (65531225393).

It can be written as a sum of positive squares in only one way, i.e., 46057022881 + 19474202500 = 214609^2 + 139550^2 .

It is a cyclic number.

It is not a de Polignac number, because 65531225381 - 2¹⁰ = 65531224357 is a prime.

It is a super-2 number, since 2×65531225381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65531228381) 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, 32765612690 + 32765612691.

It is an arithmetic number, because the mean of its divisors is an integer number (32765612691).

Almost surely, 2^65531225381 is an apocalyptic number.

It is an amenable number.

65531225381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65531225381 is an equidigital number, since it uses as much as digits as its factorization.

65531225381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 41.

The spelling of 65531225381 in words is "sixty-five billion, five hundred thirty-one million, two hundred twenty-five thousand, three hundred eighty-one".