36641644693 has 2 divisors, whose sum is σ = 36641644694. Its totient is φ = 36641644692.

The previous prime is 36641644643. The next prime is 36641644703. The reversal of 36641644693 is 39644614663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33137833444 + 3503811249 = 182038^2 + 59193^2 .

It is a cyclic number.

It is not a de Polignac number, because 36641644693 - 2²⁵ = 36608090261 is a prime.

It is a super-2 number, since 2×36641644693² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 36641644693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36641644643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18320822346 + 18320822347.

It is an arithmetic number, because the mean of its divisors is an integer number (18320822347).

Almost surely, 2^36641644693 is an apocalyptic number.

It is an amenable number.

36641644693 is a deficient number, since it is larger than the sum of its proper divisors (1).

36641644693 is an equidigital number, since it uses as much as digits as its factorization.

36641644693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 52.

The spelling of 36641644693 in words is "thirty-six billion, six hundred forty-one million, six hundred forty-four thousand, six hundred ninety-three".