1853856878417 has 2 divisors, whose sum is σ = 1853856878418. Its totient is φ = 1853856878416.

The previous prime is 1853856878413. The next prime is 1853856878519. The reversal of 1853856878417 is 7148786583581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1193783500816 + 660073377601 = 1092604^2 + 812449^2 .

It is a cyclic number.

It is not a de Polignac number, because 1853856878417 - 2² = 1853856878413 is a prime.

It is not a weakly prime, because it can be changed into another prime (1853856878413) 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, 926928439208 + 926928439209.

It is an arithmetic number, because the mean of its divisors is an integer number (926928439209).

Almost surely, 2^{1853856878417} is an apocalyptic number.

It is an amenable number.

1853856878417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1853856878417 is an equidigital number, since it uses as much as digits as its factorization.

1853856878417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 361267200, while the sum is 71.

The spelling of 1853856878417 in words is "one trillion, eight hundred fifty-three billion, eight hundred fifty-six million, eight hundred seventy-eight thousand, four hundred seventeen".