40664773 has 2 divisors, whose sum is σ = 40664774. Its totient is φ = 40664772.

The previous prime is 40664749. The next prime is 40664783. The reversal of 40664773 is 37746604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26399044 + 14265729 = 5138^2 + 3777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40664773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40664783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20332386 + 20332387.

It is an arithmetic number, because the mean of its divisors is an integer number (20332387).

Almost surely, 2^40664773 is an apocalyptic number.

It is an amenable number.

40664773 is a deficient number, since it is larger than the sum of its proper divisors (1).

40664773 is an equidigital number, since it uses as much as digits as its factorization.

40664773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 40664773 is about 6376.8936795277. The cubic root of 40664773 is about 343.8793660524.

The spelling of 40664773 in words is "forty million, six hundred sixty-four thousand, seven hundred seventy-three".