666220453 has 2 divisors, whose sum is σ = 666220454. Its totient is φ = 666220452.

The previous prime is 666220433. The next prime is 666220487. The reversal of 666220453 is 354022666.

It is an a-pointer prime, because the next prime (666220487) can be obtained adding 666220453 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505260484 + 160959969 = 22478^2 + 12687^2 .

It is a cyclic number.

It is not a de Polignac number, because 666220453 - 2⁵ = 666220421 is a prime.

It is equal to p_34592452 and since 666220453 and 34592452 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666220433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333110226 + 333110227.

It is an arithmetic number, because the mean of its divisors is an integer number (333110227).

Almost surely, 2^666220453 is an apocalyptic number.

It is an amenable number.

666220453 is a deficient number, since it is larger than the sum of its proper divisors (1).

666220453 is an equidigital number, since it uses as much as digits as its factorization.

666220453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 666220453 is about 25811.2466378515. The cubic root of 666220453 is about 873.3855194651.

The spelling of 666220453 in words is "six hundred sixty-six million, two hundred twenty thousand, four hundred fifty-three".