816638170485 has 16 divisors (see below), whose sum is σ = 1341935156736. Its totient is φ = 423768996288.

The previous prime is 816638170471. The next prime is 816638170507. The reversal of 816638170485 is 584071836618.

It is a happy number.

It is not a de Polignac number, because 816638170485 - 2⁶ = 816638170421 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 735709509 + ... + 735710618.

It is an arithmetic number, because the mean of its divisors is an integer number (83870947296).

Almost surely, 2^816638170485 is an apocalyptic number.

It is an amenable number.

816638170485 is a deficient number, since it is larger than the sum of its proper divisors (525296986251).

816638170485 is a wasteful number, since it uses less digits than its factorization.

816638170485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471420172.

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 816638170485 in words is "eight hundred sixteen billion, six hundred thirty-eight million, one hundred seventy thousand, four hundred eighty-five".