520156666 has 16 divisors (see below), whose sum is σ = 791036928. Its totient is φ = 256498000.

The previous prime is 520156649. The next prime is 520156669. The reversal of 520156666 is 666651025.

It is not an unprimeable number, because it can be changed into a prime (520156669) 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, 48231 + ... + 58021.

It is an arithmetic number, because the mean of its divisors is an integer number (49439808).

Almost surely, 2^520156666 is an apocalyptic number.

520156666 is a deficient number, since it is larger than the sum of its proper divisors (270880262).

520156666 is a wasteful number, since it uses less digits than its factorization.

520156666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10157.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 520156666 is about 22806.9433725784. The cubic root of 520156666 is about 804.2259014322.

The spelling of 520156666 in words is "five hundred twenty million, one hundred fifty-six thousand, six hundred sixty-six".