855821481653 has 2 divisors, whose sum is σ = 855821481654. Its totient is φ = 855821481652.

The previous prime is 855821481643. The next prime is 855821481707. The reversal of 855821481653 is 356184128558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672823186564 + 182998295089 = 820258^2 + 427783^2 .

It is a cyclic number.

It is not a de Polignac number, because 855821481653 - 2⁶ = 855821481589 is a prime.

It is a super-2 number, since 2×855821481653² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855821481643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427910740826 + 427910740827.

It is an arithmetic number, because the mean of its divisors is an integer number (427910740827).

Almost surely, 2^855821481653 is an apocalyptic number.

It is an amenable number.

855821481653 is a deficient number, since it is larger than the sum of its proper divisors (1).

855821481653 is an equidigital number, since it uses as much as digits as its factorization.

855821481653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216000, while the sum is 56.

The spelling of 855821481653 in words is "eight hundred fifty-five billion, eight hundred twenty-one million, four hundred eighty-one thousand, six hundred fifty-three".