1798825525421 has 2 divisors, whose sum is σ = 1798825525422. Its totient is φ = 1798825525420.

The previous prime is 1798825525363. The next prime is 1798825525477. The reversal of 1798825525421 is 1245255288971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1118118022921 + 680707502500 = 1057411^2 + 825050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1798825525421 is a prime.

It is a super-2 number, since 2×1798825525421² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1798825525921) 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, 899412762710 + 899412762711.

It is an arithmetic number, because the mean of its divisors is an integer number (899412762711).

Almost surely, 2^{1798825525421} is an apocalyptic number.

It is an amenable number.

1798825525421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798825525421 is an equidigital number, since it uses as much as digits as its factorization.

1798825525421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128000, while the sum is 59.

The spelling of 1798825525421 in words is "one trillion, seven hundred ninety-eight billion, eight hundred twenty-five million, five hundred twenty-five thousand, four hundred twenty-one".