123688666 has 4 divisors (see below), whose sum is σ = 185533002. Its totient is φ = 61844332.

The previous prime is 123688589. The next prime is 123688673. The reversal of 123688666 is 666886321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 68409441 + 55279225 = 8271^2 + 7435^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30922165 + ... + 30922168.

Almost surely, 2^123688666 is an apocalyptic number.

123688666 is a deficient number, since it is larger than the sum of its proper divisors (61844336).

123688666 is an equidigital number, since it uses as much as digits as its factorization.

123688666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61844335.

The product of its digits is 497664, while the sum is 46.

The square root of 123688666 is about 11121.5406306860. The cubic root of 123688666 is about 498.2454046593.

The spelling of 123688666 in words is "one hundred twenty-three million, six hundred eighty-eight thousand, six hundred sixty-six".