803257781861 has 2 divisors, whose sum is σ = 803257781862. Its totient is φ = 803257781860.

The previous prime is 803257781797. The next prime is 803257781891. The reversal of 803257781861 is 168187752308.

803257781861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 546912016225 + 256345765636 = 739535^2 + 506306^2 .

It is a cyclic number.

It is not a de Polignac number, because 803257781861 - 2⁶ = 803257781797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 803257781797 and 803257781806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (803257781891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401628890930 + 401628890931.

It is an arithmetic number, because the mean of its divisors is an integer number (401628890931).

Almost surely, 2^803257781861 is an apocalyptic number.

It is an amenable number.

803257781861 is a deficient number, since it is larger than the sum of its proper divisors (1).

803257781861 is an equidigital number, since it uses as much as digits as its factorization.

803257781861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 56.

The spelling of 803257781861 in words is "eight hundred three billion, two hundred fifty-seven million, seven hundred eighty-one thousand, eight hundred sixty-one".