40128505069 has 2 divisors, whose sum is σ = 40128505070. Its totient is φ = 40128505068.

The previous prime is 40128505033. The next prime is 40128505091. The reversal of 40128505069 is 96050582104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36233122500 + 3895382569 = 190350^2 + 62413^2 .

It is a cyclic number.

It is not a de Polignac number, because 40128505069 - 2¹⁷ = 40128373997 is a prime.

It is a super-2 number, since 2×40128505069² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40128502069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064252534 + 20064252535.

It is an arithmetic number, because the mean of its divisors is an integer number (20064252535).

Almost surely, 2^40128505069 is an apocalyptic number.

It is an amenable number.

40128505069 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128505069 is an equidigital number, since it uses as much as digits as its factorization.

40128505069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 40128505069 in words is "forty billion, one hundred twenty-eight million, five hundred five thousand, sixty-nine".