478661665 has 8 divisors (see below), whose sum is σ = 577281600. Its totient is φ = 381004272.

The previous prime is 478661653. The next prime is 478661683. The reversal of 478661665 is 566166874.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 478661665 - 2⁵ = 478661633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239539 + ... + 241528.

It is an arithmetic number, because the mean of its divisors is an integer number (72160200).

Almost surely, 2^478661665 is an apocalyptic number.

It is an amenable number.

478661665 is a deficient number, since it is larger than the sum of its proper divisors (98619935).

478661665 is a wasteful number, since it uses less digits than its factorization.

478661665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481271.

The product of its digits is 1451520, while the sum is 49.

The square root of 478661665 is about 21878.3378024931. The cubic root of 478661665 is about 782.2451558115.

The spelling of 478661665 in words is "four hundred seventy-eight million, six hundred sixty-one thousand, six hundred sixty-five".