999780448253 has 2 divisors, whose sum is σ = 999780448254. Its totient is φ = 999780448252.

The previous prime is 999780448241. The next prime is 999780448313. The reversal of 999780448253 is 352844087999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714663962884 + 285116485369 = 845378^2 + 533963^2 .

It is a cyclic number.

It is not a de Polignac number, because 999780448253 - 2⁴ = 999780448237 is a prime.

It is a super-2 number, since 2×999780448253² (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 (999780448223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499890224126 + 499890224127.

It is an arithmetic number, because the mean of its divisors is an integer number (499890224127).

Almost surely, 2^999780448253 is an apocalyptic number.

It is an amenable number.

999780448253 is a deficient number, since it is larger than the sum of its proper divisors (1).

999780448253 is an equidigital number, since it uses as much as digits as its factorization.

999780448253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156764160, while the sum is 68.

The spelling of 999780448253 in words is "nine hundred ninety-nine billion, seven hundred eighty million, four hundred forty-eight thousand, two hundred fifty-three".