2165356206404 has 6 divisors (see below), whose sum is σ = 3789373361214. Its totient is φ = 1082678103200.

The previous prime is 2165356206401. The next prime is 2165356206427. The reversal of 2165356206404 is 4046026535612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1626670668100 + 538685538304 = 1275410^2 + 733952^2 .

It is a super-2 number, since 2×2165356206404² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2165356206401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270669525797 + ... + 270669525804.

It is an arithmetic number, because the mean of its divisors is an integer number (631562226869).

Almost surely, 2^{2165356206404} is an apocalyptic number.

It is an amenable number.

2165356206404 is a deficient number, since it is larger than the sum of its proper divisors (1624017154810).

2165356206404 is a wasteful number, since it uses less digits than its factorization.

2165356206404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541339051605 (or 541339051603 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 2165356206404 in words is "two trillion, one hundred sixty-five billion, three hundred fifty-six million, two hundred six thousand, four hundred four".