66729433 has 2 divisors, whose sum is σ = 66729434. Its totient is φ = 66729432.

The previous prime is 66729431. The next prime is 66729469. The reversal of 66729433 is 33492766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66634569 + 94864 = 8163^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 66729433 - 2¹ = 66729431 is a prime.

Together with 66729431, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66729431) 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, 33364716 + 33364717.

It is an arithmetic number, because the mean of its divisors is an integer number (33364717).

Almost surely, 2^66729433 is an apocalyptic number.

It is an amenable number.

66729433 is a deficient number, since it is larger than the sum of its proper divisors (1).

66729433 is an equidigital number, since it uses as much as digits as its factorization.

66729433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 40.

The square root of 66729433 is about 8168.8085422539. The cubic root of 66729433 is about 405.6073456292.

It can be divided in two parts, 66 and 729433, that multiplied together give a triangular number (48142578 = T₉₈₁₂).

The spelling of 66729433 in words is "sixty-six million, seven hundred twenty-nine thousand, four hundred thirty-three".