40655406817 has 4 divisors (see below), whose sum is σ = 40674649540. Its totient is φ = 40636164096.

The previous prime is 40655406797. The next prime is 40655406853. The reversal of 40655406817 is 71860455604.

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 968392161 + 39687014656 = 31119^2 + 199216^2 .

It is a cyclic number.

It is not a de Polignac number, because 40655406817 - 2⁷ = 40655406689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40655406017) 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, 9618192 + ... + 9622417.

It is an arithmetic number, because the mean of its divisors is an integer number (10168662385).

Almost surely, 2^40655406817 is an apocalyptic number.

It is an amenable number.

40655406817 is a deficient number, since it is larger than the sum of its proper divisors (19242723).

40655406817 is a wasteful number, since it uses less digits than its factorization.

40655406817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19242722.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 40655406817 in words is "forty billion, six hundred fifty-five million, four hundred six thousand, eight hundred seventeen".