123666256 has 40 divisors (see below), whose sum is σ = 275182784. Its totient is φ = 52738560.

The previous prime is 123666253. The next prime is 123666271. The reversal of 123666256 is 652666321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123666251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21016 + ... + 26248.

Almost surely, 2^123666256 is an apocalyptic number.

123666256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123666256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137591392).

123666256 is an abundant number, since it is smaller than the sum of its proper divisors (151516528).

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

123666256 is a wasteful number, since it uses less digits than its factorization.

123666256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459 (or 5453 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 123666256 is about 11120.5330807475. The cubic root of 123666256 is about 498.2153120236.

The spelling of 123666256 in words is "one hundred twenty-three million, six hundred sixty-six thousand, two hundred fifty-six".