111202610661 has 24 divisors (see below), whose sum is σ = 162225365016. Its totient is φ = 73400463360.

The previous prime is 111202610641. The next prime is 111202610669. The reversal of 111202610661 is 166016202111.

It can be written as a sum of positive squares in 4 ways, for example, as 47827065636 + 63375545025 = 218694^2 + 251745^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111202610661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111202610669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227061 + ... + 523413.

It is an arithmetic number, because the mean of its divisors is an integer number (6759390209).

Almost surely, 2^111202610661 is an apocalyptic number.

It is an amenable number.

111202610661 is a deficient number, since it is larger than the sum of its proper divisors (51022754355).

111202610661 is a wasteful number, since it uses less digits than its factorization.

111202610661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296773 (or 296770 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

Adding to 111202610661 its reverse (166016202111), we get a palindrome (277218812772).

The spelling of 111202610661 in words is "one hundred eleven billion, two hundred two million, six hundred ten thousand, six hundred sixty-one".