66469553 has 2 divisors, whose sum is σ = 66469554. Its totient is φ = 66469552.

The previous prime is 66469519. The next prime is 66469567. The reversal of 66469553 is 35596466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48762289 + 17707264 = 6983^2 + 4208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66469553 is a prime.

It is not a weakly prime, because it can be changed into another prime (66469253) 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, 33234776 + 33234777.

It is an arithmetic number, because the mean of its divisors is an integer number (33234777).

Almost surely, 2^66469553 is an apocalyptic number.

It is an amenable number.

66469553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66469553 is an equidigital number, since it uses as much as digits as its factorization.

66469553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 44.

The square root of 66469553 is about 8152.8861760729. The cubic root of 66469553 is about 405.0801101500.

The spelling of 66469553 in words is "sixty-six million, four hundred sixty-nine thousand, five hundred fifty-three".