206450517385 has 12 divisors (see below), whose sum is σ = 288188069508. Its totient is φ = 141566068896.

The previous prime is 206450517359. The next prime is 206450517397. The reversal of 206450517385 is 583715054602.

It can be written as a sum of positive squares in 2 ways, for example, as 128571010624 + 77879506761 = 358568^2 + 279069^2 .

It is not a de Polignac number, because 206450517385 - 2²⁵ = 206416962953 is a prime.

It is a super-2 number, since 2×206450517385² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421327342 + ... + 421327831.

It is an arithmetic number, because the mean of its divisors is an integer number (24015672459).

Almost surely, 2^206450517385 is an apocalyptic number.

It is an amenable number.

206450517385 is a deficient number, since it is larger than the sum of its proper divisors (81737552123).

206450517385 is an equidigital number, since it uses as much as digits as its factorization.

206450517385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842655192 (or 842655185 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 46.

The spelling of 206450517385 in words is "two hundred six billion, four hundred fifty million, five hundred seventeen thousand, three hundred eighty-five".