1881608139643 has 2 divisors, whose sum is σ = 1881608139644. Its totient is φ = 1881608139642.

The previous prime is 1881608139629. The next prime is 1881608139709. The reversal of 1881608139643 is 3469318061881.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881608139643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1881608139623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940804069821 + 940804069822.

It is an arithmetic number, because the mean of its divisors is an integer number (940804069822).

Almost surely, 2^{1881608139643} is an apocalyptic number.

1881608139643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881608139643 is an equidigital number, since it uses as much as digits as its factorization.

1881608139643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 1881608139643 in words is "one trillion, eight hundred eighty-one billion, six hundred eight million, one hundred thirty-nine thousand, six hundred forty-three".