816407082401 has 4 divisors (see below), whose sum is σ = 816409848852. Its totient is φ = 816404315952.

The previous prime is 816407082377. The next prime is 816407082433. The reversal of 816407082401 is 104280704618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104280704618 = 2 ⋅52140352309.

It can be written as a sum of positive squares in 2 ways, for example, as 252742480225 + 563664602176 = 502735^2 + 750776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816407082401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816407082451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879386 + ... + 1551171.

It is an arithmetic number, because the mean of its divisors is an integer number (204102462213).

Almost surely, 2^816407082401 is an apocalyptic number.

It is an amenable number.

816407082401 is a deficient number, since it is larger than the sum of its proper divisors (2766451).

816407082401 is a wasteful number, since it uses less digits than its factorization.

816407082401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766450.

The product of its (nonzero) digits is 86016, while the sum is 41.

The spelling of 816407082401 in words is "eight hundred sixteen billion, four hundred seven million, eighty-two thousand, four hundred one".