803257781891 has 2 divisors, whose sum is σ = 803257781892. Its totient is φ = 803257781890.

The previous prime is 803257781861. The next prime is 803257781927. The reversal of 803257781891 is 198187752308.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 803257781891 - 2³⁴ = 786077912707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 803257781891.

It is not a weakly prime, because it can be changed into another prime (803257781861) 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, 401628890945 + 401628890946.

It is an arithmetic number, because the mean of its divisors is an integer number (401628890946).

Almost surely, 2^803257781891 is an apocalyptic number.

803257781891 is a deficient number, since it is larger than the sum of its proper divisors (1).

803257781891 is an equidigital number, since it uses as much as digits as its factorization.

803257781891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 59.

The spelling of 803257781891 in words is "eight hundred three billion, two hundred fifty-seven million, seven hundred eighty-one thousand, eight hundred ninety-one".