666548516 has 12 divisors (see below), whose sum is σ = 1177162140. Its totient is φ = 330216480.

The previous prime is 666548513. The next prime is 666548537. The reversal of 666548516 is 615845666.

It can be written as a sum of positive squares in 2 ways, for example, as 240126016 + 426422500 = 15496^2 + 20650^2 .

It is not an unprimeable number, because it can be changed into a prime (666548513) 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, 763955 + ... + 764826.

It is an arithmetic number, because the mean of its divisors is an integer number (98096845).

Almost surely, 2^666548516 is an apocalyptic number.

It is an amenable number.

666548516 is a deficient number, since it is larger than the sum of its proper divisors (510613624).

666548516 is a wasteful number, since it uses less digits than its factorization.

666548516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528894 (or 1528892 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The square root of 666548516 is about 25817.6008955131. The cubic root of 666548516 is about 873.5288546301.

The spelling of 666548516 in words is "six hundred sixty-six million, five hundred forty-eight thousand, five hundred sixteen".