66139061839 has 2 divisors, whose sum is σ = 66139061840. Its totient is φ = 66139061838.

The previous prime is 66139061827. The next prime is 66139061851. The reversal of 66139061839 is 93816093166.

It is a balanced prime because it is at equal distance from previous prime (66139061827) and next prime (66139061851).

It is a cyclic number.

It is not a de Polignac number, because 66139061839 - 2⁷ = 66139061711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66139061869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33069530919 + 33069530920.

It is an arithmetic number, because the mean of its divisors is an integer number (33069530920).

Almost surely, 2^66139061839 is an apocalyptic number.

66139061839 is a deficient number, since it is larger than the sum of its proper divisors (1).

66139061839 is an equidigital number, since it uses as much as digits as its factorization.

66139061839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 52.

It can be divided in two parts, 661 and 39061839, that added together give a square (39062500 = 6250²).

The spelling of 66139061839 in words is "sixty-six billion, one hundred thirty-nine million, sixty-one thousand, eight hundred thirty-nine".