36646644613 has 2 divisors, whose sum is σ = 36646644614. Its totient is φ = 36646644612.

The previous prime is 36646644581. The next prime is 36646644623. The reversal of 36646644613 is 31644664663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27708265764 + 8938378849 = 166458^2 + 94543^2 .

It is a cyclic number.

It is not a de Polignac number, because 36646644613 - 2⁵ = 36646644581 is a prime.

It is a super-2 number, since 2×36646644613² (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 (36646644623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18323322306 + 18323322307.

It is an arithmetic number, because the mean of its divisors is an integer number (18323322307).

Almost surely, 2^36646644613 is an apocalyptic number.

It is an amenable number.

36646644613 is a deficient number, since it is larger than the sum of its proper divisors (1).

36646644613 is an equidigital number, since it uses as much as digits as its factorization.

36646644613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 49.

The spelling of 36646644613 in words is "thirty-six billion, six hundred forty-six million, six hundred forty-four thousand, six hundred thirteen".