666360523 has 4 divisors (see below), whose sum is σ = 677284528. Its totient is φ = 655436520.

The previous prime is 666360511. The next prime is 666360557. The reversal of 666360523 is 325063666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666360523 - 2⁹ = 666360011 is a prime.

It is a super-2 number, since 2×666360523² = 888072693225667058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666360503) 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, 5461911 + ... + 5462032.

It is an arithmetic number, because the mean of its divisors is an integer number (169321132).

Almost surely, 2^666360523 is an apocalyptic number.

666360523 is a deficient number, since it is larger than the sum of its proper divisors (10924005).

666360523 is a wasteful number, since it uses less digits than its factorization.

666360523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10924004.

The product of its (nonzero) digits is 116640, while the sum is 37.

The square root of 666360523 is about 25813.9598473384. The cubic root of 666360523 is about 873.4467236989.

The spelling of 666360523 in words is "six hundred sixty-six million, three hundred sixty thousand, five hundred twenty-three".