206430545155 has 4 divisors (see below), whose sum is σ = 247716654192. Its totient is φ = 165144436120.

The previous prime is 206430545147. The next prime is 206430545213. The reversal of 206430545155 is 551545034602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551545034602 = 2 ⋅275772517301.

It is not a de Polignac number, because 206430545155 - 2³ = 206430545147 is a prime.

It is a super-2 number, since 2×206430545155² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20643054511 + ... + 20643054520.

It is an arithmetic number, because the mean of its divisors is an integer number (61929163548).

Almost surely, 2^206430545155 is an apocalyptic number.

206430545155 is a deficient number, since it is larger than the sum of its proper divisors (41286109037).

206430545155 is an equidigital number, since it uses as much as digits as its factorization.

206430545155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41286109036.

The product of its (nonzero) digits is 360000, while the sum is 40.

Adding to 206430545155 its reverse (551545034602), we get a palindrome (757975579757).

The spelling of 206430545155 in words is "two hundred six billion, four hundred thirty million, five hundred forty-five thousand, one hundred fifty-five".