2161663201636 has 12 divisors (see below), whose sum is σ = 3782938562620. Its totient is φ = 1080823612320.

The previous prime is 2161663201631. The next prime is 2161663201637. The reversal of 2161663201636 is 6361023661612.

It can be written as a sum of positive squares in 2 ways, for example, as 1399621499136 + 762041702500 = 1183056^2 + 872950^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2161663201592 and 2161663201601.

It is not an unprimeable number, because it can be changed into a prime (2161663201631) 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, 1366131 + ... + 2487898.

Almost surely, 2^{2161663201636} is an apocalyptic number.

It is an amenable number.

2161663201636 is a deficient number, since it is larger than the sum of its proper divisors (1621275360984).

2161663201636 is a wasteful number, since it uses less digits than its factorization.

2161663201636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994254 (or 3994252 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 43.

The spelling of 2161663201636 in words is "two trillion, one hundred sixty-one billion, six hundred sixty-three million, two hundred one thousand, six hundred thirty-six".