201102055661 has 16 divisors (see below), whose sum is σ = 229229495040. Its totient is φ = 174890871360.

The previous prime is 201102055657. The next prime is 201102055669. The reversal of 201102055661 is 166550201102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 201102055661 - 2² = 201102055657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201102055669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2204405 + ... + 2293818.

It is an arithmetic number, because the mean of its divisors is an integer number (14326843440).

Almost surely, 2^201102055661 is an apocalyptic number.

It is an amenable number.

201102055661 is a deficient number, since it is larger than the sum of its proper divisors (28127439379).

201102055661 is a wasteful number, since it uses less digits than its factorization.

201102055661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4498436.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 201102055661 its reverse (166550201102), we get a palindrome (367652256763).

The spelling of 201102055661 in words is "two hundred one billion, one hundred two million, fifty-five thousand, six hundred sixty-one".