123666666 has 8 divisors (see below), whose sum is σ = 247333344. Its totient is φ = 41222220.

The previous prime is 123666659. The next prime is 123666677. The reversal of 123666666 is 666666321.

It is a happy number.

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

123666666 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

123666666 is a modest number, since divided by 66666 gives 1236 as remainder.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10305550 + ... + 10305561.

It is an arithmetic number, because the mean of its divisors is an integer number (30916668).

Almost surely, 2^123666666 is an apocalyptic number.

123666666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123666666 is a wasteful number, since it uses less digits than its factorization.

123666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20611116.

The product of its digits is 279936, while the sum is 42.

The square root of 123666666 is about 11120.5515151003. The cubic root of 123666666 is about 498.2158626131.

It can be divided in two parts, 123 and 666666, that multiplied together give a palindrome (81999918).

The spelling of 123666666 in words is "one hundred twenty-three million, six hundred sixty-six thousand, six hundred sixty-six".