1855825457 has 2 divisors, whose sum is σ = 1855825458. Its totient is φ = 1855825456.

The previous prime is 1855825397. The next prime is 1855825459. The reversal of 1855825457 is 7545285581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1737972721 + 117852736 = 41689^2 + 10856^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855825457 - 2¹⁶ = 1855759921 is a prime.

Together with 1855825459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1855825459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927912728 + 927912729.

It is an arithmetic number, because the mean of its divisors is an integer number (927912729).

Almost surely, 2^1855825457 is an apocalyptic number.

It is an amenable number.

1855825457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855825457 is an equidigital number, since it uses as much as digits as its factorization.

1855825457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240000, while the sum is 50.

The square root of 1855825457 is about 43079.2926706092. The cubic root of 1855825457 is about 1228.8882052595. Note that the first 3 decimals are identical.

The spelling of 1855825457 in words is "one billion, eight hundred fifty-five million, eight hundred twenty-five thousand, four hundred fifty-seven".