202661345 has 4 divisors (see below), whose sum is σ = 243193620. Its totient is φ = 162129072.

The previous prime is 202661341. The next prime is 202661351. The reversal of 202661345 is 543166202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543166202 = 2 ⋅271583101.

It can be written as a sum of positive squares in 2 ways, for example, as 158558464 + 44102881 = 12592^2 + 6641^2 .

It is a cyclic number.

It is not a de Polignac number, because 202661345 - 2² = 202661341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (202661341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20266130 + ... + 20266139.

It is an arithmetic number, because the mean of its divisors is an integer number (60798405).

Almost surely, 2^202661345 is an apocalyptic number.

It is an amenable number.

202661345 is a deficient number, since it is larger than the sum of its proper divisors (40532275).

202661345 is an equidigital number, since it uses as much as digits as its factorization.

202661345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40532274.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 202661345 is about 14235.9174274087. The cubic root of 202661345 is about 587.3860663324.

The spelling of 202661345 in words is "two hundred two million, six hundred sixty-one thousand, three hundred forty-five".