66256619293439 has 2 divisors, whose sum is σ = 66256619293440. Its totient is φ = 66256619293438.

The previous prime is 66256619293409. The next prime is 66256619293453. The reversal of 66256619293439 is 93439291665266.

66256619293439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66256619293439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66256619293409) 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, 33128309646719 + 33128309646720.

It is an arithmetic number, because the mean of its divisors is an integer number (33128309646720).

Almost surely, 2^{66256619293439} is an apocalyptic number.

66256619293439 is a deficient number, since it is larger than the sum of its proper divisors (1).

66256619293439 is an equidigital number, since it uses as much as digits as its factorization.

66256619293439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680244480, while the sum is 71.

The spelling of 66256619293439 in words is "sixty-six trillion, two hundred fifty-six billion, six hundred nineteen million, two hundred ninety-three thousand, four hundred thirty-nine".