3625565821 has 2 divisors, whose sum is σ = 3625565822. Its totient is φ = 3625565820.

The previous prime is 3625565767. The next prime is 3625565861. The reversal of 3625565821 is 1285655263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3026540196 + 599025625 = 55014^2 + 24475^2 .

It is an emirp because it is prime and its reverse (1285655263) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3625565821 - 2⁹ = 3625565309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3625565861) 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, 1812782910 + 1812782911.

It is an arithmetic number, because the mean of its divisors is an integer number (1812782911).

Almost surely, 2^3625565821 is an apocalyptic number.

It is an amenable number.

3625565821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3625565821 is an equidigital number, since it uses as much as digits as its factorization.

3625565821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

The square root of 3625565821 is about 60212.6715982608. The cubic root of 3625565821 is about 1536.2383342654.

The spelling of 3625565821 in words is "three billion, six hundred twenty-five million, five hundred sixty-five thousand, eight hundred twenty-one".