666260406 has 96 divisors (see below), whose sum is σ = 1704276288. Its totient is φ = 184135680.

The previous prime is 666260377. The next prime is 666260411. The reversal of 666260406 is 604062666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1123246 + ... + 1123838.

It is an arithmetic number, because the mean of its divisors is an integer number (17752878).

Almost surely, 2^666260406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666260406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (852138144).

666260406 is an abundant number, since it is smaller than the sum of its proper divisors (1038015882).

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

666260406 is a wasteful number, since it uses less digits than its factorization.

666260406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 666260406 is about 25812.0205718189. The cubic root of 666260406 is about 873.4029779875.

It can be divided in two parts, 666260 and 406, that added together give a palindrome (666666).

The spelling of 666260406 in words is "six hundred sixty-six million, two hundred sixty thousand, four hundred six".