206440655515 has 8 divisors (see below), whose sum is σ = 247734296640. Its totient is φ = 165148851072.

The previous prime is 206440655453. The next prime is 206440655539. The reversal of 206440655515 is 515556044602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206440655515 - 2¹³ = 206440647323 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198430 + ... + 672499.

It is an arithmetic number, because the mean of its divisors is an integer number (30966787080).

Almost surely, 2^206440655515 is an apocalyptic number.

206440655515 is a deficient number, since it is larger than the sum of its proper divisors (41293641125).

206440655515 is an equidigital number, since it uses as much as digits as its factorization.

206440655515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918341.

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 206440655515 in words is "two hundred six billion, four hundred forty million, six hundred fifty-five thousand, five hundred fifteen".