816081601705 has 8 divisors (see below), whose sum is σ = 979338071304. Its totient is φ = 652838515200.

The previous prime is 816081601697. The next prime is 816081601747. The reversal of 816081601705 is 507106180618.

It can be written as a sum of positive squares in 4 ways, for example, as 10977381529 + 805104220176 = 104773^2 + 897276^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816081601705 - 2³ = 816081601697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3211126 + ... + 3455935.

It is an arithmetic number, because the mean of its divisors is an integer number (122417258913).

Almost surely, 2^816081601705 is an apocalyptic number.

It is an amenable number.

816081601705 is a deficient number, since it is larger than the sum of its proper divisors (163256469599).

816081601705 is a wasteful number, since it uses less digits than its factorization.

816081601705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6691547.

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 816081601705 in words is "eight hundred sixteen billion, eighty-one million, six hundred one thousand, seven hundred five".