206138934787 has 2 divisors, whose sum is σ = 206138934788. Its totient is φ = 206138934786.

The previous prime is 206138934769. The next prime is 206138934803. The reversal of 206138934787 is 787439831602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206138934787 - 2¹⁵ = 206138902019 is a prime.

It is not a weakly prime, because it can be changed into another prime (206138934887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103069467393 + 103069467394.

It is an arithmetic number, because the mean of its divisors is an integer number (103069467394).

Almost surely, 2^206138934787 is an apocalyptic number.

206138934787 is a deficient number, since it is larger than the sum of its proper divisors (1).

206138934787 is an equidigital number, since it uses as much as digits as its factorization.

206138934787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 206138934787 in words is "two hundred six billion, one hundred thirty-eight million, nine hundred thirty-four thousand, seven hundred eighty-seven".