36843566621 has 2 divisors, whose sum is σ = 36843566622. Its totient is φ = 36843566620.

The previous prime is 36843566611. The next prime is 36843566687. The reversal of 36843566621 is 12666534863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31115196025 + 5728370596 = 176395^2 + 75686^2 .

It is a cyclic number.

It is not a de Polignac number, because 36843566621 - 2³⁴ = 19663697437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 36843566621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36843566611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18421783310 + 18421783311.

It is an arithmetic number, because the mean of its divisors is an integer number (18421783311).

Almost surely, 2^36843566621 is an apocalyptic number.

It is an amenable number.

36843566621 is a deficient number, since it is larger than the sum of its proper divisors (1).

36843566621 is an equidigital number, since it uses as much as digits as its factorization.

36843566621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 50.

The spelling of 36843566621 in words is "thirty-six billion, eight hundred forty-three million, five hundred sixty-six thousand, six hundred twenty-one".