123131220266 has 16 divisors (see below), whose sum is σ = 190128798720. Its totient is φ = 59762676240.

The previous prime is 123131220253. The next prime is 123131220271. The reversal of 123131220266 is 662022131321.

It is a happy number.

It is a super-2 number, since 2×123131220266² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1898426 + ... + 1962213.

It is an arithmetic number, because the mean of its divisors is an integer number (11883049920).

Almost surely, 2^123131220266 is an apocalyptic number.

123131220266 is a deficient number, since it is larger than the sum of its proper divisors (66997578454).

123131220266 is a wasteful number, since it uses less digits than its factorization.

123131220266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861109.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 123131220266 its reverse (662022131321), we get a palindrome (785153351587).

The spelling of 123131220266 in words is "one hundred twenty-three billion, one hundred thirty-one million, two hundred twenty thousand, two hundred sixty-six".