40391278757 has 2 divisors, whose sum is σ = 40391278758. Its totient is φ = 40391278756.

The previous prime is 40391278717. The next prime is 40391278789. The reversal of 40391278757 is 75787219304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34346838241 + 6044440516 = 185329^2 + 77746^2 .

It is a cyclic number.

It is not a de Polignac number, because 40391278757 - 2⁶ = 40391278693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40391278699 and 40391278708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40391278717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20195639378 + 20195639379.

It is an arithmetic number, because the mean of its divisors is an integer number (20195639379).

Almost surely, 2^40391278757 is an apocalyptic number.

It is an amenable number.

40391278757 is a deficient number, since it is larger than the sum of its proper divisors (1).

40391278757 is an equidigital number, since it uses as much as digits as its factorization.

40391278757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 40391278757 in words is "forty billion, three hundred ninety-one million, two hundred seventy-eight thousand, seven hundred fifty-seven".