40017312763921 has 2 divisors, whose sum is σ = 40017312763922. Its totient is φ = 40017312763920.

The previous prime is 40017312763907. The next prime is 40017312763937. The reversal of 40017312763921 is 12936721371004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39675133392400 + 342179371521 = 6298820^2 + 584961^2 .

It is a cyclic number.

It is not a de Polignac number, because 40017312763921 - 2²⁵ = 40017279209489 is a prime.

It is not a weakly prime, because it can be changed into another prime (40017312764921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20008656381960 + 20008656381961.

It is an arithmetic number, because the mean of its divisors is an integer number (20008656381961).

Almost surely, 2^{40017312763921} is an apocalyptic number.

It is an amenable number.

40017312763921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40017312763921 is an equidigital number, since it uses as much as digits as its factorization.

40017312763921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 40017312763921 in words is "forty trillion, seventeen billion, three hundred twelve million, seven hundred sixty-three thousand, nine hundred twenty-one".