66654320531 has 2 divisors, whose sum is σ = 66654320532. Its totient is φ = 66654320530.

The previous prime is 66654320507. The next prime is 66654320533. The reversal of 66654320531 is 13502345666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66654320531 - 2¹⁰ = 66654319507 is a prime.

It is a super-2 number, since 2×66654320531² (a number of 22 digits) contains 22 as substring.

Together with 66654320533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66654320533) 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, 33327160265 + 33327160266.

It is an arithmetic number, because the mean of its divisors is an integer number (33327160266).

Almost surely, 2^66654320531 is an apocalyptic number.

66654320531 is a deficient number, since it is larger than the sum of its proper divisors (1).

66654320531 is an equidigital number, since it uses as much as digits as its factorization.

66654320531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 66654320531 in words is "sixty-six billion, six hundred fifty-four million, three hundred twenty thousand, five hundred thirty-one".