1940764638539 has 2 divisors, whose sum is σ = 1940764638540. Its totient is φ = 1940764638538.

The previous prime is 1940764638521. The next prime is 1940764638563. The reversal of 1940764638539 is 9358364670491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1940764638539 - 2³⁶ = 1872045161803 is a prime.

It is not a weakly prime, because it can be changed into another prime (1940764638139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970382319269 + 970382319270.

It is an arithmetic number, because the mean of its divisors is an integer number (970382319270).

Almost surely, 2^{1940764638539} is an apocalyptic number.

1940764638539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940764638539 is an equidigital number, since it uses as much as digits as its factorization.

1940764638539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117573120, while the sum is 65.

The spelling of 1940764638539 in words is "one trillion, nine hundred forty billion, seven hundred sixty-four million, six hundred thirty-eight thousand, five hundred thirty-nine".