666324523 has 4 divisors (see below), whose sum is σ = 667226920. Its totient is φ = 665422128.

The previous prime is 666324511. The next prime is 666324539. The reversal of 666324523 is 325423666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325423666 = 2 ⋅162711833.

It is a cyclic number.

It is not a de Polignac number, because 666324523 - 2²¹ = 664227371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666354523) 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, 450090 + ... + 451567.

It is an arithmetic number, because the mean of its divisors is an integer number (166806730).

Almost surely, 2^666324523 is an apocalyptic number.

666324523 is a deficient number, since it is larger than the sum of its proper divisors (902397).

666324523 is an equidigital number, since it uses as much as digits as its factorization.

666324523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902396.

The product of its digits is 155520, while the sum is 37.

The square root of 666324523 is about 25813.2625407948. The cubic root of 666324523 is about 873.4309941515.

The spelling of 666324523 in words is "six hundred sixty-six million, three hundred twenty-four thousand, five hundred twenty-three".