36545637421 has 2 divisors, whose sum is σ = 36545637422. Its totient is φ = 36545637420.

The previous prime is 36545637413. The next prime is 36545637433. The reversal of 36545637421 is 12473654563.

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., 29511460521 + 7034176900 = 171789^2 + 83870^2 .

It is a cyclic number.

It is not a de Polignac number, because 36545637421 - 2³ = 36545637413 is a prime.

It is a super-2 number, since 2×36545637421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36545635421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18272818710 + 18272818711.

It is an arithmetic number, because the mean of its divisors is an integer number (18272818711).

Almost surely, 2^36545637421 is an apocalyptic number.

It is an amenable number.

36545637421 is a deficient number, since it is larger than the sum of its proper divisors (1).

36545637421 is an equidigital number, since it uses as much as digits as its factorization.

36545637421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 46.

The spelling of 36545637421 in words is "thirty-six billion, five hundred forty-five million, six hundred thirty-seven thousand, four hundred twenty-one".