206120615523 has 4 divisors (see below), whose sum is σ = 274827487368. Its totient is φ = 137413743680.

The previous prime is 206120615521. The next prime is 206120615527. The reversal of 206120615523 is 325516021602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206120615523 - 2¹ = 206120615521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206120615521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34353435918 + ... + 34353435923.

It is an arithmetic number, because the mean of its divisors is an integer number (68706871842).

Almost surely, 2^206120615523 is an apocalyptic number.

206120615523 is a deficient number, since it is larger than the sum of its proper divisors (68706871845).

206120615523 is an equidigital number, since it uses as much as digits as its factorization.

206120615523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68706871844.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 206120615523 in words is "two hundred six billion, one hundred twenty million, six hundred fifteen thousand, five hundred twenty-three".