66402126719 has 2 divisors, whose sum is σ = 66402126720. Its totient is φ = 66402126718.

The previous prime is 66402126689. The next prime is 66402126731. The reversal of 66402126719 is 91762120466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66402126719 is a prime.

It is a super-2 number, since 2×66402126719² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66402126719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66402146719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201063359 + 33201063360.

It is an arithmetic number, because the mean of its divisors is an integer number (33201063360).

Almost surely, 2^66402126719 is an apocalyptic number.

66402126719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66402126719 is an equidigital number, since it uses as much as digits as its factorization.

66402126719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 66402126719 in words is "sixty-six billion, four hundred two million, one hundred twenty-six thousand, seven hundred nineteen".