1881608139629 has 2 divisors, whose sum is σ = 1881608139630. Its totient is φ = 1881608139628.

The previous prime is 1881608139623. The next prime is 1881608139643. The reversal of 1881608139629 is 9269318061881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1871984922025 + 9623217604 = 1368205^2 + 98098^2 .

It is an emirp because it is prime and its reverse (9269318061881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881608139629 - 2⁴⁰ = 782096511853 is a prime.

It is a super-2 number, since 2×1881608139629² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940804069814 + 940804069815.

It is an arithmetic number, because the mean of its divisors is an integer number (940804069815).

Almost surely, 2^{1881608139629} is an apocalyptic number.

It is an amenable number.

1881608139629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881608139629 is an equidigital number, since it uses as much as digits as its factorization.

1881608139629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8957952, while the sum is 62.

The spelling of 1881608139629 in words is "one trillion, eight hundred eighty-one billion, six hundred eight million, one hundred thirty-nine thousand, six hundred twenty-nine".