1908981853157 has 2 divisors, whose sum is σ = 1908981853158. Its totient is φ = 1908981853156.

The previous prime is 1908981853151. The next prime is 1908981853159. The reversal of 1908981853157 is 7513581898091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204130934241 + 704850918916 = 1097329^2 + 839554^2 .

It is an emirp because it is prime and its reverse (7513581898091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1908981853157 - 2²² = 1908977658853 is a prime.

Together with 1908981853159, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1908981853093 and 1908981853102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1908981853151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954490926578 + 954490926579.

It is an arithmetic number, because the mean of its divisors is an integer number (954490926579).

Almost surely, 2^{1908981853157} is an apocalyptic number.

It is an amenable number.

1908981853157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1908981853157 is an equidigital number, since it uses as much as digits as its factorization.

1908981853157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 65.

The spelling of 1908981853157 in words is "one trillion, nine hundred eight billion, nine hundred eighty-one million, eight hundred fifty-three thousand, one hundred fifty-seven".