475808864521 has 3 divisors (see below), whose sum is σ = 475809554311. Its totient is φ = 475808174732.

The previous prime is 475808864507. The next prime is 475808864549. The reversal of 475808864521 is 125468808574.

The square root of 475808864521 is 689789.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 24090454521 + 451718410000 = 155211^2 + 672100^2 .

It is not a de Polignac number, because 475808864521 - 2¹³ = 475808856329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (475808864821) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 344895 + ... + 1034683.

Almost surely, 2^475808864521 is an apocalyptic number.

475808864521 is the 689789-th square number.

475808864521 is the 344895-th centered octagonal number.

It is an amenable number.

475808864521 is a deficient number, since it is larger than the sum of its proper divisors (689790).

475808864521 is an frugal number, since it uses more digits than its factorization.

475808864521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379578 (or 689789 counting only the distinct ones).

The product of its (nonzero) digits is 17203200, while the sum is 58.

The spelling of 475808864521 in words is "four hundred seventy-five billion, eight hundred eight million, eight hundred sixty-four thousand, five hundred twenty-one".