66275987 has 2 divisors, whose sum is σ = 66275988. Its totient is φ = 66275986.

The previous prime is 66275983. The next prime is 66275999. The reversal of 66275987 is 78957266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66275987 - 2² = 66275983 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66275983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33137993 + 33137994.

It is an arithmetic number, because the mean of its divisors is an integer number (33137994).

Almost surely, 2^66275987 is an apocalyptic number.

66275987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66275987 is an equidigital number, since it uses as much as digits as its factorization.

66275987 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 66275987 is about 8141.0065102541. The cubic root of 66275987 is about 404.6865165482.

The spelling of 66275987 in words is "sixty-six million, two hundred seventy-five thousand, nine hundred eighty-seven".