40445536561 has 2 divisors, whose sum is σ = 40445536562. Its totient is φ = 40445536560.

The previous prime is 40445536529. The next prime is 40445536577. The reversal of 40445536561 is 16563554404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35940576400 + 4504960161 = 189580^2 + 67119^2 .

It is a cyclic number.

It is not a de Polignac number, because 40445536561 - 2⁵ = 40445536529 is a prime.

It is not a weakly prime, because it can be changed into another prime (40445530561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20222768280 + 20222768281.

It is an arithmetic number, because the mean of its divisors is an integer number (20222768281).

Almost surely, 2^40445536561 is an apocalyptic number.

It is an amenable number.

40445536561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40445536561 is an equidigital number, since it uses as much as digits as its factorization.

40445536561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 40445536561 in words is "forty billion, four hundred forty-five million, five hundred thirty-six thousand, five hundred sixty-one".