816725674309 has 2 divisors, whose sum is σ = 816725674310. Its totient is φ = 816725674308.

The previous prime is 816725674253. The next prime is 816725674379. The reversal of 816725674309 is 903476527618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474679660900 + 342046013409 = 688970^2 + 584847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816725674309 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816725674379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408362837154 + 408362837155.

It is an arithmetic number, because the mean of its divisors is an integer number (408362837155).

It is a 1-persistent number, because it is pandigital, but 2⋅816725674309 = 1633451348618 is not.

Almost surely, 2^816725674309 is an apocalyptic number.

It is an amenable number.

816725674309 is a deficient number, since it is larger than the sum of its proper divisors (1).

816725674309 is an equidigital number, since it uses as much as digits as its factorization.

816725674309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 816725674309 in words is "eight hundred sixteen billion, seven hundred twenty-five million, six hundred seventy-four thousand, three hundred nine".