520204471999 has 4 divisors (see below), whose sum is σ = 520455902040. Its totient is φ = 519953041960.

The previous prime is 520204471967. The next prime is 520204472023. The reversal of 520204471999 is 999174402025.

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 520204471999 - 2⁵ = 520204471967 is a prime.

It is a super-4 number, since 4×520204471999⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520204471939) 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, 125711917 + ... + 125716054.

It is an arithmetic number, because the mean of its divisors is an integer number (130113975510).

Almost surely, 2^520204471999 is an apocalyptic number.

520204471999 is a deficient number, since it is larger than the sum of its proper divisors (251430041).

520204471999 is a wasteful number, since it uses less digits than its factorization.

520204471999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251430040.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 520204471999 in words is "five hundred twenty billion, two hundred four million, four hundred seventy-one thousand, nine hundred ninety-nine".