816651575827 has 4 divisors (see below), whose sum is σ = 822526767160. Its totient is φ = 810776384496.

The previous prime is 816651575809. The next prime is 816651575869. The reversal of 816651575827 is 728575156618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 816651575827 - 2¹⁹ = 816651051539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816651575527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2937595458 + ... + 2937595735.

It is an arithmetic number, because the mean of its divisors is an integer number (205631691790).

Almost surely, 2^816651575827 is an apocalyptic number.

816651575827 is a deficient number, since it is larger than the sum of its proper divisors (5875191333).

816651575827 is a wasteful number, since it uses less digits than its factorization.

816651575827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5875191332.

The product of its digits is 28224000, while the sum is 61.

The spelling of 816651575827 in words is "eight hundred sixteen billion, six hundred fifty-one million, five hundred seventy-five thousand, eight hundred twenty-seven".