666598873 has 4 divisors (see below), whose sum is σ = 666695988. Its totient is φ = 666501760.

The previous prime is 666598853. The next prime is 666598897. The reversal of 666598873 is 378895666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378895666 = 2 ⋅189447833.

It can be written as a sum of positive squares in 2 ways, for example, as 203832729 + 462766144 = 14277^2 + 21512^2 .

It is a cyclic number.

It is not a de Polignac number, because 666598873 - 2¹³ = 666590681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666598853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37408 + ... + 52273.

It is an arithmetic number, because the mean of its divisors is an integer number (166673997).

Almost surely, 2^666598873 is an apocalyptic number.

It is an amenable number.

666598873 is a deficient number, since it is larger than the sum of its proper divisors (97115).

666598873 is an equidigital number, since it uses as much as digits as its factorization.

666598873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97114.

The product of its digits is 13063680, while the sum is 58.

The square root of 666598873 is about 25818.5761226292. The cubic root of 666598873 is about 873.5508521211.

The spelling of 666598873 in words is "six hundred sixty-six million, five hundred ninety-eight thousand, eight hundred seventy-three".