1881607615397 has 2 divisors, whose sum is σ = 1881607615398. Its totient is φ = 1881607615396.

The previous prime is 1881607615373. The next prime is 1881607615399. The reversal of 1881607615397 is 7935167061881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 982901719396 + 898705896001 = 991414^2 + 948001^2 .

It is an emirp because it is prime and its reverse (7935167061881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1881607615397 - 2⁶ = 1881607615333 is a prime.

Together with 1881607615399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881607615399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940803807698 + 940803807699.

It is an arithmetic number, because the mean of its divisors is an integer number (940803807699).

Almost surely, 2^{1881607615397} is an apocalyptic number.

It is an amenable number.

1881607615397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881607615397 is an equidigital number, since it uses as much as digits as its factorization.

1881607615397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 1881607615397 in words is "one trillion, eight hundred eighty-one billion, six hundred seven million, six hundred fifteen thousand, three hundred ninety-seven".