669386256 has 120 divisors (see below), whose sum is σ = 2194529184. Its totient is φ = 173859840.

The previous prime is 669386243. The next prime is 669386257. The reversal of 669386256 is 652683966.

It is a junction number, because it is equal to n+sod(n) for n = 669386199 and 669386208.

It is not an unprimeable number, because it can be changed into a prime (669386257) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12936 + ... + 38808.

Almost surely, 2^669386256 is an apocalyptic number.

669386256 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a pronic number, being equal to 25872×25873.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669386256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097264592).

669386256 is an abundant number, since it is smaller than the sum of its proper divisors (1525142928).

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

669386256 is a wasteful number, since it uses less digits than its factorization.

669386256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25909 (or 25896 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 51.

The square root of 669386256 is about 25872.4999951686. The cubic root of 669386256 is about 874.7667431574.

The spelling of 669386256 in words is "six hundred sixty-nine million, three hundred eighty-six thousand, two hundred fifty-six".