36436660721 has 2 divisors, whose sum is σ = 36436660722. Its totient is φ = 36436660720.

The previous prime is 36436660693. The next prime is 36436660783. The reversal of 36436660721 is 12706663463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19478110096 + 16958550625 = 139564^2 + 130225^2 .

It is a cyclic number.

It is not a de Polignac number, because 36436660721 - 2⁶ = 36436660657 is a prime.

It is not a weakly prime, because it can be changed into another prime (36436660021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18218330360 + 18218330361.

It is an arithmetic number, because the mean of its divisors is an integer number (18218330361).

Almost surely, 2^36436660721 is an apocalyptic number.

It is an amenable number.

36436660721 is a deficient number, since it is larger than the sum of its proper divisors (1).

36436660721 is an equidigital number, since it uses as much as digits as its factorization.

36436660721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 44.

The spelling of 36436660721 in words is "thirty-six billion, four hundred thirty-six million, six hundred sixty thousand, seven hundred twenty-one".