40208680261 has 2 divisors, whose sum is σ = 40208680262. Its totient is φ = 40208680260.

The previous prime is 40208680199. The next prime is 40208680297. The reversal of 40208680261 is 16208680204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22581072900 + 17627607361 = 150270^2 + 132769^2 .

It is a cyclic number.

It is not a de Polignac number, because 40208680261 - 2¹³ = 40208672069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40208680261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40208620261) 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, 20104340130 + 20104340131.

It is an arithmetic number, because the mean of its divisors is an integer number (20104340131).

Almost surely, 2^40208680261 is an apocalyptic number.

It is an amenable number.

40208680261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40208680261 is an equidigital number, since it uses as much as digits as its factorization.

40208680261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 40208680261 in words is "forty billion, two hundred eight million, six hundred eighty thousand, two hundred sixty-one".