66660387371 has 2 divisors, whose sum is σ = 66660387372. Its totient is φ = 66660387370.

The previous prime is 66660387361. The next prime is 66660387473. The reversal of 66660387371 is 17378306666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66660387371 is a prime.

It is not a weakly prime, because it can be changed into another prime (66660387361) 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, 33330193685 + 33330193686.

It is an arithmetic number, because the mean of its divisors is an integer number (33330193686).

Almost surely, 2^66660387371 is an apocalyptic number.

66660387371 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660387371 is an equidigital number, since it uses as much as digits as its factorization.

66660387371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 53.

The spelling of 66660387371 in words is "sixty-six billion, six hundred sixty million, three hundred eighty-seven thousand, three hundred seventy-one".