206240243553 has 16 divisors (see below), whose sum is σ = 318825498240. Its totient is φ = 131515517232.

The previous prime is 206240243551. The next prime is 206240243557. The reversal of 206240243553 is 355342042602.

206240243553 is a `hidden beast` number, since 2 + 0 + 62 + 4 + 0 + 2 + 43 + 553 = 666.

It is not a de Polignac number, because 206240243553 - 2¹ = 206240243551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206240243551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166054326 + ... + 166055567.

It is an arithmetic number, because the mean of its divisors is an integer number (19926593640).

Almost surely, 2^206240243553 is an apocalyptic number.

206240243553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

206240243553 is a deficient number, since it is larger than the sum of its proper divisors (112585254687).

206240243553 is a wasteful number, since it uses less digits than its factorization.

206240243553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332109925 (or 332109919 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

The spelling of 206240243553 in words is "two hundred six billion, two hundred forty million, two hundred forty-three thousand, five hundred fifty-three".