206413521256 has 32 divisors (see below), whose sum is σ = 395305344000. Its totient is φ = 100999267776.

The previous prime is 206413521239. The next prime is 206413521269. The reversal of 206413521256 is 652125314602.

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, 3894985 + ... + 3947623.

It is an arithmetic number, because the mean of its divisors is an integer number (12353292000).

Almost surely, 2^206413521256 is an apocalyptic number.

It is an amenable number.

206413521256 is a deficient number, since it is larger than the sum of its proper divisors (188891822744).

206413521256 is a wasteful number, since it uses less digits than its factorization.

206413521256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63121 (or 63117 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 206413521256 its reverse (652125314602), we get a palindrome (858538835858).

The spelling of 206413521256 in words is "two hundred six billion, four hundred thirteen million, five hundred twenty-one thousand, two hundred fifty-six".