50821164409 has 2 divisors, whose sum is σ = 50821164410. Its totient is φ = 50821164408.

The previous prime is 50821164379. The next prime is 50821164421. The reversal of 50821164409 is 90446112805.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50247705600 + 573458809 = 224160^2 + 23947^2 .

It is a cyclic number.

It is not a de Polignac number, because 50821164409 - 2¹⁹ = 50820640121 is a prime.

It is not a weakly prime, because it can be changed into another prime (50821164809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25410582204 + 25410582205.

It is an arithmetic number, because the mean of its divisors is an integer number (25410582205).

Almost surely, 2^50821164409 is an apocalyptic number.

It is an amenable number.

50821164409 is a deficient number, since it is larger than the sum of its proper divisors (1).

50821164409 is an equidigital number, since it uses as much as digits as its factorization.

50821164409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 50821164409 in words is "fifty billion, eight hundred twenty-one million, one hundred sixty-four thousand, four hundred nine".