66654857 has 2 divisors, whose sum is σ = 66654858. Its totient is φ = 66654856.

The previous prime is 66654829. The next prime is 66654881. The reversal of 66654857 is 75845666.

66654857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66113161 + 541696 = 8131^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 66654857 - 2¹⁶ = 66589321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66654827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327428 + 33327429.

It is an arithmetic number, because the mean of its divisors is an integer number (33327429).

Almost surely, 2^66654857 is an apocalyptic number.

It is an amenable number.

66654857 is a deficient number, since it is larger than the sum of its proper divisors (1).

66654857 is an equidigital number, since it uses as much as digits as its factorization.

66654857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 47.

The square root of 66654857 is about 8164.2425858128. The cubic root of 66654857 is about 405.4561886982.

The spelling of 66654857 in words is "sixty-six million, six hundred fifty-four thousand, eight hundred fifty-seven".