816321576979 has 2 divisors, whose sum is σ = 816321576980. Its totient is φ = 816321576978.

The previous prime is 816321576953. The next prime is 816321576991. The reversal of 816321576979 is 979675123618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816321576979 - 2¹⁹ = 816321052691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816321576979.

It is not a weakly prime, because it can be changed into another prime (816321576919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408160788489 + 408160788490.

It is an arithmetic number, because the mean of its divisors is an integer number (408160788490).

Almost surely, 2^816321576979 is an apocalyptic number.

816321576979 is a deficient number, since it is larger than the sum of its proper divisors (1).

816321576979 is an equidigital number, since it uses as much as digits as its factorization.

816321576979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 64.

The spelling of 816321576979 in words is "eight hundred sixteen billion, three hundred twenty-one million, five hundred seventy-six thousand, nine hundred seventy-nine".