666090129 has 4 divisors (see below), whose sum is σ = 888120176. Its totient is φ = 444060084.

The previous prime is 666090127. The next prime is 666090199. The reversal of 666090129 is 921090666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 666090129 - 2¹ = 666090127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666090127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111015019 + ... + 111015024.

It is an arithmetic number, because the mean of its divisors is an integer number (222030044).

Almost surely, 2^666090129 is an apocalyptic number.

It is an amenable number.

666090129 is a deficient number, since it is larger than the sum of its proper divisors (222030047).

666090129 is a wasteful number, since it uses less digits than its factorization.

666090129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222030046.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 666090129 is about 25808.7219559590. The cubic root of 666090129 is about 873.3285660864.

The spelling of 666090129 in words is "six hundred sixty-six million, ninety thousand, one hundred twenty-nine".