2161331533604 has 24 divisors (see below), whose sum is σ = 3811516430400. Its totient is φ = 1072358852000.

The previous prime is 2161331533549. The next prime is 2161331533609. The reversal of 2161331533604 is 4063351331612.

It is not an unprimeable number, because it can be changed into a prime (2161331533609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3731264 + ... + 4271415.

It is an arithmetic number, because the mean of its divisors is an integer number (158813184600).

Almost surely, 2^{2161331533604} is an apocalyptic number.

It is an amenable number.

2161331533604 is a deficient number, since it is larger than the sum of its proper divisors (1650184896796).

2161331533604 is a wasteful number, since it uses less digits than its factorization.

2161331533604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8003203 (or 8003201 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 38.

The spelling of 2161331533604 in words is "two trillion, one hundred sixty-one billion, three hundred thirty-one million, five hundred thirty-three thousand, six hundred four".