2201656645 has 4 divisors (see below), whose sum is σ = 2641987980. Its totient is φ = 1761325312.

The previous prime is 2201656643. The next prime is 2201656651. The reversal of 2201656645 is 5466561022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1297872676 + 903783969 = 36026^2 + 30063^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201656645 - 2¹ = 2201656643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201656643) 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, 220165660 + ... + 220165669.

It is an arithmetic number, because the mean of its divisors is an integer number (660496995).

Almost surely, 2^2201656645 is an apocalyptic number.

It is an amenable number.

2201656645 is a deficient number, since it is larger than the sum of its proper divisors (440331335).

2201656645 is an equidigital number, since it uses as much as digits as its factorization.

2201656645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440331334.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2201656645 is about 46921.8141699572. The cubic root of 2201656645 is about 1300.9178222635.

The spelling of 2201656645 in words is "two billion, two hundred one million, six hundred fifty-six thousand, six hundred forty-five".