206851813331 has 4 divisors (see below), whose sum is σ = 206852871432. Its totient is φ = 206850755232.

The previous prime is 206851813327. The next prime is 206851813367. The reversal of 206851813331 is 133318158602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 206851813331 - 2² = 206851813327 is a prime.

It is a super-2 number, since 2×206851813331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206851819331) 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, 140870 + ... + 658443.

It is an arithmetic number, because the mean of its divisors is an integer number (51713217858).

Almost surely, 2^206851813331 is an apocalyptic number.

206851813331 is a deficient number, since it is larger than the sum of its proper divisors (1058101).

206851813331 is an equidigital number, since it uses as much as digits as its factorization.

206851813331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058100.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 206851813331 in words is "two hundred six billion, eight hundred fifty-one million, eight hundred thirteen thousand, three hundred thirty-one".