666926040 has 128 divisors (see below), whose sum is σ = 2215537920. Its totient is φ = 159244800.

The previous prime is 666926017. The next prime is 666926041. The reversal of 666926040 is 40629666.

It is a self number, because there is not a number n which added to its sum of digits gives 666926040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666926041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84670 + ... + 92210.

It is an arithmetic number, because the mean of its divisors is an integer number (17308890).

Almost surely, 2^666926040 is an apocalyptic number.

666926040 is a gapful number since it is divisible by the number (60) 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 666926040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107768960).

666926040 is an abundant number, since it is smaller than the sum of its proper divisors (1548611880).

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

666926040 is a wasteful number, since it uses less digits than its factorization.

666926040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7633 (or 7629 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 666926040 is about 25824.9112292763. The cubic root of 666926040 is about 873.6937417856.

The spelling of 666926040 in words is "six hundred sixty-six million, nine hundred twenty-six thousand, forty".