40766954561 has 2 divisors, whose sum is σ = 40766954562. Its totient is φ = 40766954560.

The previous prime is 40766954539. The next prime is 40766954563. The reversal of 40766954561 is 16545966704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36240356161 + 4526598400 = 190369^2 + 67280^2 .

It is a cyclic number.

It is not a de Polignac number, because 40766954561 - 2²² = 40762760257 is a prime.

It is a Sophie Germain prime.

Together with 40766954563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40766954563) 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, 20383477280 + 20383477281.

It is an arithmetic number, because the mean of its divisors is an integer number (20383477281).

Almost surely, 2^40766954561 is an apocalyptic number.

It is an amenable number.

40766954561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40766954561 is an equidigital number, since it uses as much as digits as its factorization.

40766954561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 40766954561 in words is "forty billion, seven hundred sixty-six million, nine hundred fifty-four thousand, five hundred sixty-one".