40660404209 has 2 divisors, whose sum is σ = 40660404210. Its totient is φ = 40660404208.

The previous prime is 40660404199. The next prime is 40660404217. The reversal of 40660404209 is 90240406604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39946018225 + 714385984 = 199865^2 + 26728^2 .

It is a cyclic number.

It is not a de Polignac number, because 40660404209 - 2¹⁶ = 40660338673 is a prime.

It is not a weakly prime, because it can be changed into another prime (40660404229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20330202104 + 20330202105.

It is an arithmetic number, because the mean of its divisors is an integer number (20330202105).

Almost surely, 2^40660404209 is an apocalyptic number.

It is an amenable number.

40660404209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40660404209 is an equidigital number, since it uses as much as digits as its factorization.

40660404209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 40660404209 in words is "forty billion, six hundred sixty million, four hundred four thousand, two hundred nine".