666250040 has 32 divisors (see below), whose sum is σ = 1503621360. Its totient is φ = 265689600.

The previous prime is 666250021. The next prime is 666250069. The reversal of 666250040 is 40052666.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 666249985 and 666250012.

It is a congruent number.

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, 11921 + ... + 38400.

Almost surely, 2^666250040 is an apocalyptic number.

It is an amenable number.

666250040 is an abundant number, since it is smaller than the sum of its proper divisors (837371320).

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

666250040 is a wasteful number, since it uses less digits than its factorization.

666250040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50663 (or 50659 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 666250040 is about 25811.8197731194. The cubic root of 666250040 is about 873.3984483560.

The spelling of 666250040 in words is "six hundred sixty-six million, two hundred fifty thousand, forty".