667624628889 has 15 divisors (see below), whose sum is σ = 997326788997. Its totient is φ = 445078183428.

The previous prime is 667624628887. The next prime is 667624628899. The reversal of 667624628889 is 988826426766.

It is a happy number.

The square root of 667624628889 is 817083.

It is a perfect power (a square), and thus also a powerful number.

667624628889 is a `hidden beast` number, since 6 + 6 + 7 + 6 + 2 + 462 + 88 + 89 = 666.

667624628889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667624628889 - 2¹ = 667624628887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667624628887) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7308354 + ... + 7399140.

Almost surely, 2^667624628889 is an apocalyptic number.

667624628889 is the 817083-rd square number.

667624628889 is the 408542-nd centered octagonal number.

It is an amenable number.

667624628889 is a deficient number, since it is larger than the sum of its proper divisors (329702160108).

667624628889 is an frugal number, since it uses more digits than its factorization.

667624628889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181586 (or 90790 counting only the distinct ones).

The product of its digits is 668860416, while the sum is 72.

The spelling of 667624628889 in words is "six hundred sixty-seven billion, six hundred twenty-four million, six hundred twenty-eight thousand, eight hundred eighty-nine".