206157905663 has 2 divisors, whose sum is σ = 206157905664. Its totient is φ = 206157905662.

The previous prime is 206157905633. The next prime is 206157905711. The reversal of 206157905663 is 366509751602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206157905663 - 2³⁰ = 205084163839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206157905633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103078952831 + 103078952832.

It is an arithmetic number, because the mean of its divisors is an integer number (103078952832).

Almost surely, 2^206157905663 is an apocalyptic number.

206157905663 is a deficient number, since it is larger than the sum of its proper divisors (1).

206157905663 is an equidigital number, since it uses as much as digits as its factorization.

206157905663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 206157905663 in words is "two hundred six billion, one hundred fifty-seven million, nine hundred five thousand, six hundred sixty-three".