666225155719 has 2 divisors, whose sum is σ = 666225155720. Its totient is φ = 666225155718.

The previous prime is 666225155683. The next prime is 666225155789. The reversal of 666225155719 is 917551522666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666225155719 - 2⁷ = 666225155591 is a prime.

It is a super-2 number, since 2×666225155719² (a number of 24 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 666225155719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666225155789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333112577859 + 333112577860.

It is an arithmetic number, because the mean of its divisors is an integer number (333112577860).

Almost surely, 2^666225155719 is an apocalyptic number.

666225155719 is a deficient number, since it is larger than the sum of its proper divisors (1).

666225155719 is an equidigital number, since it uses as much as digits as its factorization.

666225155719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804000, while the sum is 55.

The spelling of 666225155719 in words is "six hundred sixty-six billion, two hundred twenty-five million, one hundred fifty-five thousand, seven hundred nineteen".