206765309551 has 2 divisors, whose sum is σ = 206765309552. Its totient is φ = 206765309550.

The previous prime is 206765309473. The next prime is 206765309557. The reversal of 206765309551 is 155903567602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206765309551 - 2²³ = 206756920943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206765309495 and 206765309504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206765309557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103382654775 + 103382654776.

It is an arithmetic number, because the mean of its divisors is an integer number (103382654776).

Almost surely, 2^206765309551 is an apocalyptic number.

206765309551 is a deficient number, since it is larger than the sum of its proper divisors (1).

206765309551 is an equidigital number, since it uses as much as digits as its factorization.

206765309551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1701000, while the sum is 49.

The spelling of 206765309551 in words is "two hundred six billion, seven hundred sixty-five million, three hundred nine thousand, five hundred fifty-one".