40245445769 has 2 divisors, whose sum is σ = 40245445770. Its totient is φ = 40245445768.

The previous prime is 40245445729. The next prime is 40245445789. The reversal of 40245445769 is 96754454204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23412978169 + 16832467600 = 153013^2 + 129740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40245445769 is a prime.

It is a super-2 number, since 2×40245445769² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40245445729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20122722884 + 20122722885.

It is an arithmetic number, because the mean of its divisors is an integer number (20122722885).

Almost surely, 2^40245445769 is an apocalyptic number.

It is an amenable number.

40245445769 is a deficient number, since it is larger than the sum of its proper divisors (1).

40245445769 is an equidigital number, since it uses as much as digits as its factorization.

40245445769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4838400, while the sum is 50.

The spelling of 40245445769 in words is "forty billion, two hundred forty-five million, four hundred forty-five thousand, seven hundred sixty-nine".