666577516 has 24 divisors (see below), whose sum is σ = 1294130880. Its totient is φ = 297853200.

The previous prime is 666577507. The next prime is 666577517. The reversal of 666577516 is 615775666.

It is a happy number.

It is a super-3 number, since 3×666577516³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666577516.

It is not an unprimeable number, because it can be changed into a prime (666577517) 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 7 ways as a sum of consecutive naturals, for example, 125790 + ... + 130981.

It is an arithmetic number, because the mean of its divisors is an integer number (53922120).

Almost surely, 2^666577516 is an apocalyptic number.

It is an amenable number.

666577516 is a deficient number, since it is larger than the sum of its proper divisors (627553364).

666577516 is a wasteful number, since it uses less digits than its factorization.

666577516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256845 (or 256843 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 49.

The square root of 666577516 is about 25818.1625217598. The cubic root of 666577516 is about 873.5415228600.

The spelling of 666577516 in words is "six hundred sixty-six million, five hundred seventy-seven thousand, five hundred sixteen".