66313161311987 has 2 divisors, whose sum is σ = 66313161311988. Its totient is φ = 66313161311986.

The previous prime is 66313161311927. The next prime is 66313161312049. The reversal of 66313161311987 is 78911316131366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66313161311987 - 2¹⁸ = 66313161049843 is a prime.

It is not a weakly prime, because it can be changed into another prime (66313161311927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33156580655993 + 33156580655994.

It is an arithmetic number, because the mean of its divisors is an integer number (33156580655994).

Almost surely, 2^{66313161311987} is an apocalyptic number.

66313161311987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66313161311987 is an equidigital number, since it uses as much as digits as its factorization.

66313161311987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 56.

The spelling of 66313161311987 in words is "sixty-six trillion, three hundred thirteen billion, one hundred sixty-one million, three hundred eleven thousand, nine hundred eighty-seven".