36644644644661 has 2 divisors, whose sum is σ = 36644644644662. Its totient is φ = 36644644644660.

The previous prime is 36644644644607. The next prime is 36644644644677. The reversal of 36644644644661 is 16644644644663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21608133887025 + 15036510757636 = 4648455^2 + 3877694^2 .

It is a cyclic number.

It is not a de Polignac number, because 36644644644661 - 2²⁷ = 36644510426933 is a prime.

It is a super-2 number, since 2×36644644644661² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 36644644644593 and 36644644644602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36644644644161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18322322322330 + 18322322322331.

It is an arithmetic number, because the mean of its divisors is an integer number (18322322322331).

Almost surely, 2^{36644644644661} is an apocalyptic number.

It is an amenable number.

36644644644661 is a deficient number, since it is larger than the sum of its proper divisors (1).

36644644644661 is an equidigital number, since it uses as much as digits as its factorization.

36644644644661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 573308928, while the sum is 64.

The spelling of 36644644644661 in words is "thirty-six trillion, six hundred forty-four billion, six hundred forty-four million, six hundred forty-four thousand, six hundred sixty-one".