36166343621 has 2 divisors, whose sum is σ = 36166343622. Its totient is φ = 36166343620.

The previous prime is 36166343617. The next prime is 36166343669. The reversal of 36166343621 is 12634366163.

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., 30376655521 + 5789688100 = 174289^2 + 76090^2 .

It is a cyclic number.

It is not a de Polignac number, because 36166343621 - 2² = 36166343617 is a prime.

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 (36166343821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18083171810 + 18083171811.

It is an arithmetic number, because the mean of its divisors is an integer number (18083171811).

Almost surely, 2^36166343621 is an apocalyptic number.

It is an amenable number.

36166343621 is a deficient number, since it is larger than the sum of its proper divisors (1).

36166343621 is an equidigital number, since it uses as much as digits as its factorization.

36166343621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 41.

The spelling of 36166343621 in words is "thirty-six billion, one hundred sixty-six million, three hundred forty-three thousand, six hundred twenty-one".