66534553 has 2 divisors, whose sum is σ = 66534554. Its totient is φ = 66534552.

The previous prime is 66534527. The next prime is 66534571. The reversal of 66534553 is 35543566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46131264 + 20403289 = 6792^2 + 4517^2 .

It is a cyclic number.

It is not a de Polignac number, because 66534553 - 2⁵ = 66534521 is a prime.

It is not a weakly prime, because it can be changed into another prime (66534593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33267276 + 33267277.

It is an arithmetic number, because the mean of its divisors is an integer number (33267277).

Almost surely, 2^66534553 is an apocalyptic number.

It is an amenable number.

66534553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66534553 is an equidigital number, since it uses as much as digits as its factorization.

66534553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 37.

The square root of 66534553 is about 8156.8715203808. The cubic root of 66534553 is about 405.2121085760.

The spelling of 66534553 in words is "sixty-six million, five hundred thirty-four thousand, five hundred fifty-three".