40805752621 has 2 divisors, whose sum is σ = 40805752622. Its totient is φ = 40805752620.

The previous prime is 40805752601. The next prime is 40805752717. The reversal of 40805752621 is 12625750804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40180202500 + 625550121 = 200450^2 + 25011^2 .

It is a cyclic number.

It is not a de Polignac number, because 40805752621 - 2⁹ = 40805752109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40805752601) 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, 20402876310 + 20402876311.

It is an arithmetic number, because the mean of its divisors is an integer number (20402876311).

Almost surely, 2^40805752621 is an apocalyptic number.

It is an amenable number.

40805752621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40805752621 is an equidigital number, since it uses as much as digits as its factorization.

40805752621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 40805752621 in words is "forty billion, eight hundred five million, seven hundred fifty-two thousand, six hundred twenty-one".