41565752621 has 2 divisors, whose sum is σ = 41565752622. Its totient is φ = 41565752620.

The previous prime is 41565752609. The next prime is 41565752623. The reversal of 41565752621 is 12625756514.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40236348100 + 1329404521 = 200590^2 + 36461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41565752621 is a prime.

Together with 41565752623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41565752623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20782876310 + 20782876311.

It is an arithmetic number, because the mean of its divisors is an integer number (20782876311).

Almost surely, 2^41565752621 is an apocalyptic number.

It is an amenable number.

41565752621 is a deficient number, since it is larger than the sum of its proper divisors (1).

41565752621 is an equidigital number, since it uses as much as digits as its factorization.

41565752621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504000, while the sum is 44.

The spelling of 41565752621 in words is "forty-one billion, five hundred sixty-five million, seven hundred fifty-two thousand, six hundred twenty-one".