816638170478 has 16 divisors (see below), whose sum is σ = 1351359976176. Its totient is φ = 367716999360.

The previous prime is 816638170471. The next prime is 816638170507. The reversal of 816638170478 is 874071836618.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816638170471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383037476 + ... + 383039607.

It is an arithmetic number, because the mean of its divisors is an integer number (84459998511).

Almost surely, 2^816638170478 is an apocalyptic number.

816638170478 is a deficient number, since it is larger than the sum of its proper divisors (534721805698).

816638170478 is a wasteful number, since it uses less digits than its factorization.

816638170478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766077139.

The product of its (nonzero) digits is 10838016, while the sum is 59.

The spelling of 816638170478 in words is "eight hundred sixteen billion, six hundred thirty-eight million, one hundred seventy thousand, four hundred seventy-eight".