816638170504 has 32 divisors (see below), whose sum is σ = 1680093780120. Its totient is φ = 369798414336.

The previous prime is 816638170471. The next prime is 816638170507. The reversal of 816638170504 is 405071836618.

It is a happy number.

816638170504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 380380562500 + 436257608004 = 616750^2 + 660498^2 .

It is a super-2 number, since 2×816638170504² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (816638170507) 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, 74072697 + ... + 74083720.

Almost surely, 2^816638170504 is an apocalyptic number.

It is an amenable number.

816638170504 is an abundant number, since it is smaller than the sum of its proper divisors (863455609616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816638170504 is a wasteful number, since it uses less digits than its factorization.

816638170504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148156489 (or 148156485 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 816638170504 in words is "eight hundred sixteen billion, six hundred thirty-eight million, one hundred seventy thousand, five hundred four".