475493921857 has 4 divisors (see below), whose sum is σ = 491890264020. Its totient is φ = 459097579696.

The previous prime is 475493921821. The next prime is 475493921863. The reversal of 475493921857 is 758129394574.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77151173121 + 398342748736 = 277761^2 + 631144^2 .

It is not a de Polignac number, because 475493921857 - 2⁷ = 475493921729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (475493921887) 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, 8198171038 + ... + 8198171095.

It is an arithmetic number, because the mean of its divisors is an integer number (122972566005).

Almost surely, 2^475493921857 is an apocalyptic number.

It is an amenable number.

475493921857 is a deficient number, since it is larger than the sum of its proper divisors (16396342163).

475493921857 is a wasteful number, since it uses less digits than its factorization.

475493921857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16396342162.

The product of its digits is 76204800, while the sum is 64.

The spelling of 475493921857 in words is "four hundred seventy-five billion, four hundred ninety-three million, nine hundred twenty-one thousand, eight hundred fifty-seven".