40766640221 has 2 divisors, whose sum is σ = 40766640222. Its totient is φ = 40766640220.

The previous prime is 40766640133. The next prime is 40766640281. The reversal of 40766640221 is 12204666704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21458148196 + 19308492025 = 146486^2 + 138955^2 .

It is a cyclic number.

It is not a de Polignac number, because 40766640221 - 2¹⁰ = 40766639197 is a prime.

It is a super-3 number, since 3×40766640221³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40766640281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20383320110 + 20383320111.

It is an arithmetic number, because the mean of its divisors is an integer number (20383320111).

Almost surely, 2^40766640221 is an apocalyptic number.

It is an amenable number.

40766640221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40766640221 is an equidigital number, since it uses as much as digits as its factorization.

40766640221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 40766640221 in words is "forty billion, seven hundred sixty-six million, six hundred forty thousand, two hundred twenty-one".