1005123439643 has 2 divisors, whose sum is σ = 1005123439644. Its totient is φ = 1005123439642.

The previous prime is 1005123439627. The next prime is 1005123439693. The reversal of 1005123439643 is 3469343215001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1005123439643 - 2⁴ = 1005123439627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1005123439643.

It is not a weakly prime, because it can be changed into another prime (1005123439693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502561719821 + 502561719822.

It is an arithmetic number, because the mean of its divisors is an integer number (502561719822).

Almost surely, 2^{1005123439643} is an apocalyptic number.

1005123439643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005123439643 is an equidigital number, since it uses as much as digits as its factorization.

1005123439643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 1005123439643 in words is "one trillion, five billion, one hundred twenty-three million, four hundred thirty-nine thousand, six hundred forty-three".