66958641947 has 2 divisors, whose sum is σ = 66958641948. Its totient is φ = 66958641946.

The previous prime is 66958641881. The next prime is 66958641961. The reversal of 66958641947 is 74914685966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66958641947 - 2¹⁰ = 66958640923 is a prime.

It is not a weakly prime, because it can be changed into another prime (66958644947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33479320973 + 33479320974.

It is an arithmetic number, because the mean of its divisors is an integer number (33479320974).

Almost surely, 2^66958641947 is an apocalyptic number.

66958641947 is a deficient number, since it is larger than the sum of its proper divisors (1).

66958641947 is an equidigital number, since it uses as much as digits as its factorization.

66958641947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 65.

The spelling of 66958641947 in words is "sixty-six billion, nine hundred fifty-eight million, six hundred forty-one thousand, nine hundred forty-seven".