206440655453 has 2 divisors, whose sum is σ = 206440655454. Its totient is φ = 206440655452.

The previous prime is 206440655441. The next prime is 206440655539. The reversal of 206440655453 is 354556044602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176974186489 + 29466468964 = 420683^2 + 171658^2 .

It is a cyclic number.

It is not a de Polignac number, because 206440655453 - 2⁶ = 206440655389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206440655423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103220327726 + 103220327727.

It is an arithmetic number, because the mean of its divisors is an integer number (103220327727).

Almost surely, 2^206440655453 is an apocalyptic number.

It is an amenable number.

206440655453 is a deficient number, since it is larger than the sum of its proper divisors (1).

206440655453 is an equidigital number, since it uses as much as digits as its factorization.

206440655453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 206440655453 in words is "two hundred six billion, four hundred forty million, six hundred fifty-five thousand, four hundred fifty-three".