206646368431 has 2 divisors, whose sum is σ = 206646368432. Its totient is φ = 206646368430.

The previous prime is 206646368429. The next prime is 206646368479. The reversal of 206646368431 is 134863646602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206646368431 - 2¹ = 206646368429 is a prime.

It is a super-2 number, since 2×206646368431² (a number of 23 digits) contains 22 as substring.

Together with 206646368429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206646362431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103323184215 + 103323184216.

It is an arithmetic number, because the mean of its divisors is an integer number (103323184216).

Almost surely, 2^206646368431 is an apocalyptic number.

206646368431 is a deficient number, since it is larger than the sum of its proper divisors (1).

206646368431 is an equidigital number, since it uses as much as digits as its factorization.

206646368431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 49.

The spelling of 206646368431 in words is "two hundred six billion, six hundred forty-six million, three hundred sixty-eight thousand, four hundred thirty-one".