1856063164421 has 2 divisors, whose sum is σ = 1856063164422. Its totient is φ = 1856063164420.

The previous prime is 1856063164381. The next prime is 1856063164537. The reversal of 1856063164421 is 1244613606581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1475326036900 + 380737127521 = 1214630^2 + 617039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1856063164421 - 2³⁰ = 1854989422597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1856063164321) 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, 928031582210 + 928031582211.

It is an arithmetic number, because the mean of its divisors is an integer number (928031582211).

Almost surely, 2^{1856063164421} is an apocalyptic number.

It is an amenable number.

1856063164421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1856063164421 is an equidigital number, since it uses as much as digits as its factorization.

1856063164421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 1856063164421 in words is "one trillion, eight hundred fifty-six billion, sixty-three million, one hundred sixty-four thousand, four hundred twenty-one".