11165200201661 has 4 divisors (see below), whose sum is σ = 12180218401824. Its totient is φ = 10150182001500.

The previous prime is 11165200201637. The next prime is 11165200201669. The reversal of 11165200201661 is 16610200256111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11165200201661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11165200201669) 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, 507509100065 + ... + 507509100086.

It is an arithmetic number, because the mean of its divisors is an integer number (3045054600456).

Almost surely, 2^{11165200201661} is an apocalyptic number.

11165200201661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11165200201661 is a deficient number, since it is larger than the sum of its proper divisors (1015018200163).

11165200201661 is a wasteful number, since it uses less digits than its factorization.

11165200201661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015018200162.

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 11165200201661 its reverse (16610200256111), we get a palindrome (27775400457772).

The spelling of 11165200201661 in words is "eleven trillion, one hundred sixty-five billion, two hundred million, two hundred one thousand, six hundred sixty-one".