66860947 has 2 divisors, whose sum is σ = 66860948. Its totient is φ = 66860946.

The previous prime is 66860933. The next prime is 66860951. The reversal of 66860947 is 74906866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66860947 - 2²³ = 58472339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66860897 and 66860906.

It is not a weakly prime, because it can be changed into another prime (66860917) 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, 33430473 + 33430474.

It is an arithmetic number, because the mean of its divisors is an integer number (33430474).

Almost surely, 2^66860947 is an apocalyptic number.

66860947 is a deficient number, since it is larger than the sum of its proper divisors (1).

66860947 is an equidigital number, since it uses as much as digits as its factorization.

66860947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 66860947 is about 8176.8543462630. The cubic root of 66860947 is about 405.8736351139.

The spelling of 66860947 in words is "sixty-six million, eight hundred sixty thousand, nine hundred forty-seven".