666250440 has 64 divisors (see below), whose sum is σ = 2021241600. Its totient is φ = 175667712.

The previous prime is 666250421. The next prime is 666250441. The reversal of 666250440 is 44052666.

666250440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (666250441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20512 + ... + 41871.

It is an arithmetic number, because the mean of its divisors is an integer number (31581900).

Almost surely, 2^666250440 is an apocalyptic number.

666250440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666250440 is an abundant number, since it is smaller than the sum of its proper divisors (1354991160).

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

666250440 is a wasteful number, since it uses less digits than its factorization.

666250440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62486 (or 62482 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 666250440 is about 25811.8275215065. The cubic root of 666250440 is about 873.3986231449.

The spelling of 666250440 in words is "six hundred sixty-six million, two hundred fifty thousand, four hundred forty".