206989499523 has 4 divisors (see below), whose sum is σ = 275985999368. Its totient is φ = 137992999680.

The previous prime is 206989499491. The next prime is 206989499531. The reversal of 206989499523 is 325994989602.

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

It is not a de Polignac number, because 206989499523 - 2⁵ = 206989499491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206989499543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34498249918 + ... + 34498249923.

It is an arithmetic number, because the mean of its divisors is an integer number (68996499842).

Almost surely, 2^206989499523 is an apocalyptic number.

206989499523 is a deficient number, since it is larger than the sum of its proper divisors (68996499845).

206989499523 is an equidigital number, since it uses as much as digits as its factorization.

206989499523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68996499844.

The product of its (nonzero) digits is 75582720, while the sum is 66.

The spelling of 206989499523 in words is "two hundred six billion, nine hundred eighty-nine million, four hundred ninety-nine thousand, five hundred twenty-three".