66531409453 has 2 divisors, whose sum is σ = 66531409454. Its totient is φ = 66531409452.

The previous prime is 66531409393. The next prime is 66531409459. The reversal of 66531409453 is 35490413566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38033580484 + 28497828969 = 195022^2 + 168813^2 .

It is a cyclic number.

It is not a de Polignac number, because 66531409453 - 2³³ = 57941474861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66531409459) 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, 33265704726 + 33265704727.

It is an arithmetic number, because the mean of its divisors is an integer number (33265704727).

Almost surely, 2^66531409453 is an apocalyptic number.

It is an amenable number.

66531409453 is a deficient number, since it is larger than the sum of its proper divisors (1).

66531409453 is an equidigital number, since it uses as much as digits as its factorization.

66531409453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 66531409453 in words is "sixty-six billion, five hundred thirty-one million, four hundred nine thousand, four hundred fifty-three".