816321576897 has 24 divisors (see below), whose sum is σ = 1219981314240. Its totient is φ = 525366330720.

The previous prime is 816321576887. The next prime is 816321576901. The reversal of 816321576897 is 798675123618.

It is not a de Polignac number, because 816321576897 - 2¹⁹ = 816321052609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816321576827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1453228 + ... + 1935074.

It is an arithmetic number, because the mean of its divisors is an integer number (50832554760).

Almost surely, 2^816321576897 is an apocalyptic number.

816321576897 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

816321576897 is a deficient number, since it is larger than the sum of its proper divisors (403659737343).

816321576897 is a wasteful number, since it uses less digits than its factorization.

816321576897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488373 (or 488370 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 816321576897 in words is "eight hundred sixteen billion, three hundred twenty-one million, five hundred seventy-six thousand, eight hundred ninety-seven".