1020403405225 has 12 divisors (see below), whose sum is σ = 1265320428124. Its totient is φ = 816309688320.

The previous prime is 1020403405181. The next prime is 1020403405243. The reversal of 1020403405225 is 5225043040201.

It can be written as a sum of positive squares in 6 ways, for example, as 117654488064 + 902748917161 = 343008^2 + 950131^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1020403405225 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020403405193 and 1020403405202.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 1463617 + ... + 2045233.

Almost surely, 2^{1020403405225} is an apocalyptic number.

It is an amenable number.

1020403405225 is a deficient number, since it is larger than the sum of its proper divisors (244917022899).

1020403405225 is an equidigital number, since it uses as much as digits as its factorization.

1020403405225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651804 (or 651799 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 1020403405225 its reverse (5225043040201), we get a palindrome (6245446445426).

The spelling of 1020403405225 in words is "one trillion, twenty billion, four hundred three million, four hundred five thousand, two hundred twenty-five".