666424089 has 24 divisors (see below), whose sum is σ = 1054389960. Its totient is φ = 403726848.

The previous prime is 666424063. The next prime is 666424201. The reversal of 666424089 is 980424666.

It can be written as a sum of positive squares in 4 ways, for example, as 187470864 + 478953225 = 13692^2 + 21885^2 .

It is not a de Polignac number, because 666424089 - 2²⁴ = 649646873 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (666424049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70662 + ... + 79535.

It is an arithmetic number, because the mean of its divisors is an integer number (43932915).

Almost surely, 2^666424089 is an apocalyptic number.

It is an amenable number.

666424089 is a deficient number, since it is larger than the sum of its proper divisors (387965871).

666424089 is a wasteful number, since it uses less digits than its factorization.

666424089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150249 (or 150246 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 666424089 is about 25815.1910510072. The cubic root of 666424089 is about 873.4744963271.

The spelling of 666424089 in words is "six hundred sixty-six million, four hundred twenty-four thousand, eighty-nine".