40081569221 has 2 divisors, whose sum is σ = 40081569222. Its totient is φ = 40081569220.

The previous prime is 40081569193. The next prime is 40081569379. The reversal of 40081569221 is 12296518004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35152125121 + 4929444100 = 187489^2 + 70210^2 .

It is a cyclic number.

It is not a de Polignac number, because 40081569221 - 2¹⁴ = 40081552837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40081569821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20040784610 + 20040784611.

It is an arithmetic number, because the mean of its divisors is an integer number (20040784611).

Almost surely, 2^40081569221 is an apocalyptic number.

It is an amenable number.

40081569221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40081569221 is an equidigital number, since it uses as much as digits as its factorization.

40081569221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 40081569221 in words is "forty billion, eighty-one million, five hundred sixty-nine thousand, two hundred twenty-one".