1025802530821 has 2 divisors, whose sum is σ = 1025802530822. Its totient is φ = 1025802530820.

The previous prime is 1025802530647. The next prime is 1025802530833. The reversal of 1025802530821 is 1280352085201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975776498596 + 50026032225 = 987814^2 + 223665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025802530821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025802536821) 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, 512901265410 + 512901265411.

It is an arithmetic number, because the mean of its divisors is an integer number (512901265411).

Almost surely, 2^{1025802530821} is an apocalyptic number.

It is an amenable number.

1025802530821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025802530821 is an equidigital number, since it uses as much as digits as its factorization.

1025802530821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 1025802530821 in words is "one trillion, twenty-five billion, eight hundred two million, five hundred thirty thousand, eight hundred twenty-one".