206131551266 has 16 divisors (see below), whose sum is σ = 325494960000. Its totient is φ = 97634034288.

The previous prime is 206131551233. The next prime is 206131551319. The reversal of 206131551266 is 662155131602.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338216 + ... + 725708.

It is an arithmetic number, because the mean of its divisors is an integer number (20343435000).

Almost surely, 2^206131551266 is an apocalyptic number.

206131551266 is a deficient number, since it is larger than the sum of its proper divisors (119363408734).

206131551266 is a wasteful number, since it uses less digits than its factorization.

206131551266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401513.

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 206131551266 its reverse (662155131602), we get a palindrome (868286682868).

The spelling of 206131551266 in words is "two hundred six billion, one hundred thirty-one million, five hundred fifty-one thousand, two hundred sixty-six".