1881608139709 has 2 divisors, whose sum is σ = 1881608139710. Its totient is φ = 1881608139708.

The previous prime is 1881608139643. The next prime is 1881608139727. The reversal of 1881608139709 is 9079318061881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1244719548900 + 636888590809 = 1115670^2 + 798053^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881608139709 - 2¹³ = 1881608131517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881608139809) 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, 940804069854 + 940804069855.

It is an arithmetic number, because the mean of its divisors is an integer number (940804069855).

Almost surely, 2^{1881608139709} is an apocalyptic number.

It is an amenable number.

1881608139709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881608139709 is an equidigital number, since it uses as much as digits as its factorization.

1881608139709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 61.

The spelling of 1881608139709 in words is "one trillion, eight hundred eighty-one billion, six hundred eight million, one hundred thirty-nine thousand, seven hundred nine".