123456813668 has 6 divisors (see below), whose sum is σ = 216049423926. Its totient is φ = 61728406832.

The previous prime is 123456813661. The next prime is 123456813731. The reversal of 123456813668 is 866318654321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 85656899584 + 37799914084 = 292672^2 + 194422^2 .

It is a super-2 number, since 2×123456813668² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123456813661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15432101705 + ... + 15432101712.

It is an arithmetic number, because the mean of its divisors is an integer number (36008237321).

Almost surely, 2^123456813668 is an apocalyptic number.

It is an amenable number.

123456813668 is a deficient number, since it is larger than the sum of its proper divisors (92592610258).

123456813668 is a wasteful number, since it uses less digits than its factorization.

123456813668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30864203421 (or 30864203419 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 53.

The spelling of 123456813668 in words is "one hundred twenty-three billion, four hundred fifty-six million, eight hundred thirteen thousand, six hundred sixty-eight".