53665265132981 has 2 divisors, whose sum is σ = 53665265132982. Its totient is φ = 53665265132980.

The previous prime is 53665265132959. The next prime is 53665265132987. The reversal of 53665265132981 is 18923156256635.

It is a happy number.

53665265132981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53648812966225 + 16452166756 = 7324535^2 + 128266^2 .

It is a cyclic number.

It is not a de Polignac number, because 53665265132981 - 2²² = 53665260938677 is a prime.

It is a super-2 number, since 2×53665265132981² (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 (53665265132987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26832632566490 + 26832632566491.

It is an arithmetic number, because the mean of its divisors is an integer number (26832632566491).

Almost surely, 2^{53665265132981} is an apocalyptic number.

It is an amenable number.

53665265132981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53665265132981 is an equidigital number, since it uses as much as digits as its factorization.

53665265132981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984000, while the sum is 62.

The spelling of 53665265132981 in words is "fifty-three trillion, six hundred sixty-five billion, two hundred sixty-five million, one hundred thirty-two thousand, nine hundred eighty-one".