66506130578387 has 2 divisors, whose sum is σ = 66506130578388. Its totient is φ = 66506130578386.

The previous prime is 66506130578357. The next prime is 66506130578411. The reversal of 66506130578387 is 78387503160566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66506130578387 - 2⁸ = 66506130578131 is a prime.

It is not a weakly prime, because it can be changed into another prime (66506130578357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33253065289193 + 33253065289194.

It is an arithmetic number, because the mean of its divisors is an integer number (33253065289194).

Almost surely, 2^{66506130578387} is an apocalyptic number.

66506130578387 is a deficient number, since it is larger than the sum of its proper divisors (1).

66506130578387 is an equidigital number, since it uses as much as digits as its factorization.

66506130578387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 152409600, while the sum is 65.

The spelling of 66506130578387 in words is "sixty-six trillion, five hundred six billion, one hundred thirty million, five hundred seventy-eight thousand, three hundred eighty-seven".