36641221261 has 2 divisors, whose sum is σ = 36641221262. Its totient is φ = 36641221260.

The previous prime is 36641221219. The next prime is 36641221277. The reversal of 36641221261 is 16212214663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29792831236 + 6848390025 = 172606^2 + 82755^2 .

It is a cyclic number.

It is not a de Polignac number, because 36641221261 - 2¹³ = 36641213069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36641231261) 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, 18320610630 + 18320610631.

It is an arithmetic number, because the mean of its divisors is an integer number (18320610631).

Almost surely, 2^36641221261 is an apocalyptic number.

It is an amenable number.

36641221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

36641221261 is an equidigital number, since it uses as much as digits as its factorization.

36641221261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The spelling of 36641221261 in words is "thirty-six billion, six hundred forty-one million, two hundred twenty-one thousand, two hundred sixty-one".