66506130578357 has 2 divisors, whose sum is σ = 66506130578358. Its totient is φ = 66506130578356.

The previous prime is 66506130578309. The next prime is 66506130578387. The reversal of 66506130578357 is 75387503160566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61045687954276 + 5460442624081 = 7813174^2 + 2336759^2 .

It is a cyclic number.

It is not a de Polignac number, because 66506130578357 - 2²⁶ = 66506063469493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66506130578357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66506130578387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33253065289178 + 33253065289179.

It is an arithmetic number, because the mean of its divisors is an integer number (33253065289179).

Almost surely, 2^{66506130578357} is an apocalyptic number.

It is an amenable number.

66506130578357 is a deficient number, since it is larger than the sum of its proper divisors (1).

66506130578357 is an equidigital number, since it uses as much as digits as its factorization.

66506130578357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256000, while the sum is 62.

The spelling of 66506130578357 in words is "sixty-six trillion, five hundred six billion, one hundred thirty million, five hundred seventy-eight thousand, three hundred fifty-seven".