40385476561 has 2 divisors, whose sum is σ = 40385476562. Its totient is φ = 40385476560.

The previous prime is 40385476541. The next prime is 40385476609. The reversal of 40385476561 is 16567458304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26681262336 + 13704214225 = 163344^2 + 117065^2 .

It is a cyclic number.

It is not a de Polignac number, because 40385476561 - 2¹¹ = 40385474513 is a prime.

It is not a weakly prime, because it can be changed into another prime (40385476501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20192738280 + 20192738281.

It is an arithmetic number, because the mean of its divisors is an integer number (20192738281).

Almost surely, 2^40385476561 is an apocalyptic number.

It is an amenable number.

40385476561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40385476561 is an equidigital number, since it uses as much as digits as its factorization.

40385476561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 40385476561 in words is "forty billion, three hundred eighty-five million, four hundred seventy-six thousand, five hundred sixty-one".