520618666 has 8 divisors (see below), whose sum is σ = 781025184. Its totient is φ = 260276940.

The previous prime is 520618663. The next prime is 520618669. The reversal of 520618666 is 666816025.

It is an interprime number because it is at equal distance from previous prime (520618663) and next prime (520618669).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×520618666³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (520618663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20731 + ... + 38353.

It is an arithmetic number, because the mean of its divisors is an integer number (97628148).

Almost surely, 2^520618666 is an apocalyptic number.

520618666 is a deficient number, since it is larger than the sum of its proper divisors (260406518).

520618666 is a wasteful number, since it uses less digits than its factorization.

520618666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32396.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 520618666 is about 22817.0696190374. The cubic root of 520618666 is about 804.4639338312.

It can be divided in two parts, 520618 and 666, that added together give a square (521284 = 722²).

The spelling of 520618666 in words is "five hundred twenty million, six hundred eighteen thousand, six hundred sixty-six".