478211531681 has 8 divisors (see below), whose sum is σ = 515007129000. Its totient is φ = 441417376512.

The previous prime is 478211531659. The next prime is 478211531729. The reversal of 478211531681 is 186135112874.

It can be written as a sum of positive squares in 4 ways, for example, as 72423421456 + 405788110225 = 269116^2 + 637015^2 .

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 478211531681 - 2¹⁴ = 478211515297 is a prime.

It is a super-2 number, since 2×478211531681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (478211551681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385331 + ... + 1051143.

It is an arithmetic number, because the mean of its divisors is an integer number (64375891125).

Almost surely, 2^478211531681 is an apocalyptic number.

It is an amenable number.

478211531681 is a deficient number, since it is larger than the sum of its proper divisors (36795597319).

478211531681 is a wasteful number, since it uses less digits than its factorization.

478211531681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721075.

The product of its digits is 322560, while the sum is 47.

The spelling of 478211531681 in words is "four hundred seventy-eight billion, two hundred eleven million, five hundred thirty-one thousand, six hundred eighty-one".