66957287 has 2 divisors, whose sum is σ = 66957288. Its totient is φ = 66957286.

The previous prime is 66957229. The next prime is 66957299. The reversal of 66957287 is 78275966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66957287 - 2²² = 62762983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66957227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33478643 + 33478644.

It is an arithmetic number, because the mean of its divisors is an integer number (33478644).

Almost surely, 2^66957287 is an apocalyptic number.

66957287 is a deficient number, since it is larger than the sum of its proper divisors (1).

66957287 is an equidigital number, since it uses as much as digits as its factorization.

66957287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 50.

The square root of 66957287 is about 8182.7432441694. The cubic root of 66957287 is about 406.0684827897.

The spelling of 66957287 in words is "sixty-six million, nine hundred fifty-seven thousand, two hundred eighty-seven".