476821665 has 12 divisors (see below), whose sum is σ = 826490964. Its totient is φ = 254304864.

The previous prime is 476821649. The next prime is 476821669. The reversal of 476821665 is 566128674.

It can be written as a sum of positive squares in 2 ways, for example, as 204175521 + 272646144 = 14289^2 + 16512^2 .

It is not a de Polignac number, because 476821665 - 2⁴ = 476821649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 10596037 = 476821665 / (4 + 7 + 6 + 8 + 2 + 1 + 6 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 476821665.

It is not an unprimeable number, because it can be changed into a prime (476821669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5297974 + ... + 5298063.

It is an arithmetic number, because the mean of its divisors is an integer number (68874247).

Almost surely, 2^476821665 is an apocalyptic number.

476821665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

476821665 is a deficient number, since it is larger than the sum of its proper divisors (349669299).

476821665 is a wasteful number, since it uses less digits than its factorization.

476821665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10596048 (or 10596045 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 476821665 is about 21836.2465868107. The cubic root of 476821665 is about 781.2415385537.

The spelling of 476821665 in words is "four hundred seventy-six million, eight hundred twenty-one thousand, six hundred sixty-five".