1856224118213 has 2 divisors, whose sum is σ = 1856224118214. Its totient is φ = 1856224118212.

The previous prime is 1856224118173. The next prime is 1856224118219. The reversal of 1856224118213 is 3128114226581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1484493686404 + 371730431809 = 1218398^2 + 609697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1856224118213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1856224118219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 928112059106 + 928112059107.

It is an arithmetic number, because the mean of its divisors is an integer number (928112059107).

Almost surely, 2^{1856224118213} is an apocalyptic number.

It is an amenable number.

1856224118213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1856224118213 is an equidigital number, since it uses as much as digits as its factorization.

1856224118213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 184320, while the sum is 44.

The spelling of 1856224118213 in words is "one trillion, eight hundred fifty-six billion, two hundred twenty-four million, one hundred eighteen thousand, two hundred thirteen".