666406592 has 56 divisors (see below), whose sum is σ = 1343655936. Its totient is φ = 327898368.

The previous prime is 666406583. The next prime is 666406621. The reversal of 666406592 is 295604666.

It is a super-2 number, since 2×666406592² = 888195491722108928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1324613 + ... + 1325115.

It is an arithmetic number, because the mean of its divisors is an integer number (23993856).

Almost surely, 2^666406592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666406592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671827968).

666406592 is an abundant number, since it is smaller than the sum of its proper divisors (677249344).

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

666406592 is a wasteful number, since it uses less digits than its factorization.

666406592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 666406592 is about 25814.8521591738. The cubic root of 666406592 is about 873.4668518870.

The spelling of 666406592 in words is "six hundred sixty-six million, four hundred six thousand, five hundred ninety-two".