40366554665 has 4 divisors (see below), whose sum is σ = 48439865604. Its totient is φ = 32293243728.

The previous prime is 40366554661. The next prime is 40366554673. The reversal of 40366554665 is 56645566304.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27448868329 + 12917686336 = 165677^2 + 113656^2 .

It is a cyclic number.

It is not a de Polignac number, because 40366554665 - 2² = 40366554661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40366554661) 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, 4036655462 + ... + 4036655471.

It is an arithmetic number, because the mean of its divisors is an integer number (12109966401).

Almost surely, 2^40366554665 is an apocalyptic number.

It is an amenable number.

40366554665 is a deficient number, since it is larger than the sum of its proper divisors (8073310939).

40366554665 is an equidigital number, since it uses as much as digits as its factorization.

40366554665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073310938.

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 40366554665 in words is "forty billion, three hundred sixty-six million, five hundred fifty-four thousand, six hundred sixty-five".