40445501689 has 2 divisors, whose sum is σ = 40445501690. Its totient is φ = 40445501688.

The previous prime is 40445501653. The next prime is 40445501843. The reversal of 40445501689 is 98610554404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21056331664 + 19389170025 = 145108^2 + 139245^2 .

It is a cyclic number.

It is not a de Polignac number, because 40445501689 - 2⁹ = 40445501177 is a prime.

It is not a weakly prime, because it can be changed into another prime (40445504689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20222750844 + 20222750845.

It is an arithmetic number, because the mean of its divisors is an integer number (20222750845).

Almost surely, 2^40445501689 is an apocalyptic number.

It is an amenable number.

40445501689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40445501689 is an equidigital number, since it uses as much as digits as its factorization.

40445501689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 40445501689 in words is "forty billion, four hundred forty-five million, five hundred one thousand, six hundred eighty-nine".