6645166453 has 2 divisors, whose sum is σ = 6645166454. Its totient is φ = 6645166452.

The previous prime is 6645166309. The next prime is 6645166469. The reversal of 6645166453 is 3546615466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6064982884 + 580183569 = 77878^2 + 24087^2 .

It is a cyclic number.

It is not a de Polignac number, because 6645166453 - 2⁹ = 6645165941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6645166483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322583226 + 3322583227.

It is an arithmetic number, because the mean of its divisors is an integer number (3322583227).

Almost surely, 2^6645166453 is an apocalyptic number.

It is an amenable number.

6645166453 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645166453 is an equidigital number, since it uses as much as digits as its factorization.

6645166453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 46.

The square root of 6645166453 is about 81517.8903860987. The cubic root of 6645166453 is about 1880.0466312751.

The spelling of 6645166453 in words is "six billion, six hundred forty-five million, one hundred sixty-six thousand, four hundred fifty-three".