40665665563 has 4 divisors (see below), whose sum is σ = 41238421488. Its totient is φ = 40092909640.

The previous prime is 40665665519. The next prime is 40665665581. The reversal of 40665665563 is 36556656604.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40665665563 - 2²¹ = 40663568411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40665665563.

It is not an unprimeable number, because it can be changed into a prime (40665465563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286377856 + ... + 286377997.

It is an arithmetic number, because the mean of its divisors is an integer number (10309605372).

Almost surely, 2^40665665563 is an apocalyptic number.

40665665563 is a deficient number, since it is larger than the sum of its proper divisors (572755925).

40665665563 is an equidigital number, since it uses as much as digits as its factorization.

40665665563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572755924.

The product of its (nonzero) digits is 11664000, while the sum is 52.

The spelling of 40665665563 in words is "forty billion, six hundred sixty-five million, six hundred sixty-five thousand, five hundred sixty-three".