40056734256521 has 2 divisors, whose sum is σ = 40056734256522. Its totient is φ = 40056734256520.

The previous prime is 40056734256439. The next prime is 40056734256551. The reversal of 40056734256521 is 12565243765004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37182420912121 + 2874313344400 = 6097739^2 + 1695380^2 .

It is a cyclic number.

It is not a de Polignac number, because 40056734256521 - 2¹⁰ = 40056734255497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40056734256521.

It is not a weakly prime, because it can be changed into another prime (40056734256551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20028367128260 + 20028367128261.

It is an arithmetic number, because the mean of its divisors is an integer number (20028367128261).

Almost surely, 2^{40056734256521} is an apocalyptic number.

It is an amenable number.

40056734256521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40056734256521 is an equidigital number, since it uses as much as digits as its factorization.

40056734256521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 50.

The spelling of 40056734256521 in words is "forty trillion, fifty-six billion, seven hundred thirty-four million, two hundred fifty-six thousand, five hundred twenty-one".