40656409850209 has 4 divisors (see below), whose sum is σ = 40656423072816. Its totient is φ = 40656396627604.

The previous prime is 40656409850153. The next prime is 40656409850333. The reversal of 40656409850209 is 90205890465604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40656409850209 - 2¹³ = 40656409842017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40656409850509) 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, 684762 + ... + 9043324.

It is an arithmetic number, because the mean of its divisors is an integer number (10164105768204).

Almost surely, 2^{40656409850209} is an apocalyptic number.

It is an amenable number.

40656409850209 is a deficient number, since it is larger than the sum of its proper divisors (13222607).

40656409850209 is an equidigital number, since it uses as much as digits as its factorization.

40656409850209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13222606.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 40656409850209 in words is "forty trillion, six hundred fifty-six billion, four hundred nine million, eight hundred fifty thousand, two hundred nine".