8161957603396 has 27 divisors (see below), whose sum is σ = 14327970399351. Its totient is φ = 4068291246624.

The previous prime is 8161957603391. The next prime is 8161957603421. The reversal of 8161957603396 is 6933067591618.

The square root of 8161957603396 is 2856914.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 200892204100 + 7961065399296 = 448210^2 + 2821536^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8161957603391) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1994123926 + ... + 1994128018.

Almost surely, 2^{8161957603396} is an apocalyptic number.

8161957603396 is the 2856914-th square number.

It is an amenable number.

8161957603396 is a deficient number, since it is larger than the sum of its proper divisors (6166012795955).

8161957603396 is an frugal number, since it uses more digits than its factorization.

8161957603396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8888 (or 4444 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 64.

Multiplying 8161957603396 by its sum of digits (64), we get a square (522365286617344 = 22855312²).

The spelling of 8161957603396 in words is "eight trillion, one hundred sixty-one billion, nine hundred fifty-seven million, six hundred three thousand, three hundred ninety-six".