663278453 has 2 divisors, whose sum is σ = 663278454. Its totient is φ = 663278452.

The previous prime is 663278423. The next prime is 663278471. The reversal of 663278453 is 354872366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 659565124 + 3713329 = 25682^2 + 1927^2 .

It is a cyclic number.

It is not a de Polignac number, because 663278453 - 2¹⁴ = 663262069 is a prime.

It is a super-3 number, since 3×663278453³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663278423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331639226 + 331639227.

It is an arithmetic number, because the mean of its divisors is an integer number (331639227).

Almost surely, 2^663278453 is an apocalyptic number.

It is an amenable number.

663278453 is a deficient number, since it is larger than the sum of its proper divisors (1).

663278453 is an equidigital number, since it uses as much as digits as its factorization.

663278453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 44.

The square root of 663278453 is about 25754.1929207653. The cubic root of 663278453 is about 872.0980118243.

The spelling of 663278453 in words is "six hundred sixty-three million, two hundred seventy-eight thousand, four hundred fifty-three".