666250506 has 12 divisors (see below), whose sum is σ = 1443542802. Its totient is φ = 222083496.

The previous prime is 666250493. The next prime is 666250517. The reversal of 666250506 is 605052666.

666250506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 533194281 + 133056225 = 23091^2 + 11535^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18506941 + ... + 18506976.

Almost surely, 2^666250506 is an apocalyptic number.

666250506 is an abundant number, since it is smaller than the sum of its proper divisors (777292296).

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

666250506 is a wasteful number, since it uses less digits than its factorization.

666250506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37013925 (or 37013922 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 666250506 is about 25811.8287999901. The cubic root of 666250506 is about 873.3986519851.

The spelling of 666250506 in words is "six hundred sixty-six million, two hundred fifty thousand, five hundred six".