2235566222761 has 3 divisors (see below), whose sum is σ = 2235567717943. Its totient is φ = 2235564727580.

The previous prime is 2235566222749. The next prime is 2235566222767. The reversal of 2235566222761 is 1672226655322.

The square root of 2235566222761 is 1495181.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 392651371161 + 1842914851600 = 626619^2 + 1357540^2 .

It is not a de Polignac number, because 2235566222761 - 2⁹ = 2235566222249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2235566222767) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 747591 + ... + 2242771.

Almost surely, 2^{2235566222761} is an apocalyptic number.

2235566222761 is the 1495181-st square number.

2235566222761 is the 747591-st centered octagonal number.

It is an amenable number.

2235566222761 is a deficient number, since it is larger than the sum of its proper divisors (1495182).

2235566222761 is an frugal number, since it uses more digits than its factorization.

2235566222761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2990362 (or 1495181 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 49.

Multiplying 2235566222761 by its sum of digits (49), we get a square (109542744915289 = 10466267²).

The spelling of 2235566222761 in words is "two trillion, two hundred thirty-five billion, five hundred sixty-six million, two hundred twenty-two thousand, seven hundred sixty-one".