999780448237 has 2 divisors, whose sum is σ = 999780448238. Its totient is φ = 999780448236.

The previous prime is 999780448223. The next prime is 999780448241. The reversal of 999780448237 is 732844087999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 978900487236 + 20879961001 = 989394^2 + 144499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999780448237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999780448637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499890224118 + 499890224119.

It is an arithmetic number, because the mean of its divisors is an integer number (499890224119).

Almost surely, 2^999780448237 is an apocalyptic number.

It is an amenable number.

999780448237 is a deficient number, since it is larger than the sum of its proper divisors (1).

999780448237 is an equidigital number, since it uses as much as digits as its factorization.

999780448237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 219469824, while the sum is 70.

The spelling of 999780448237 in words is "nine hundred ninety-nine billion, seven hundred eighty million, four hundred forty-eight thousand, two hundred thirty-seven".