1855216868863 has 2 divisors, whose sum is σ = 1855216868864. Its totient is φ = 1855216868862.

The previous prime is 1855216868819. The next prime is 1855216868929. The reversal of 1855216868863 is 3688686125581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1855216868863 - 2¹⁷ = 1855216737791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855216838863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927608434431 + 927608434432.

It is an arithmetic number, because the mean of its divisors is an integer number (927608434432).

Almost surely, 2^{1855216868863} is an apocalyptic number.

1855216868863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855216868863 is an equidigital number, since it uses as much as digits as its factorization.

1855216868863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132710400, while the sum is 67.

The spelling of 1855216868863 in words is "one trillion, eight hundred fifty-five billion, two hundred sixteen million, eight hundred sixty-eight thousand, eight hundred sixty-three".