40665475421 has 4 divisors (see below), whose sum is σ = 41155420992. Its totient is φ = 40175529852.

The previous prime is 40665475397. The next prime is 40665475493. The reversal of 40665475421 is 12457456604.

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.

It is a cyclic number.

It is not a de Polignac number, because 40665475421 - 2¹⁰ = 40665474397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40665475121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244972661 + ... + 244972826.

It is an arithmetic number, because the mean of its divisors is an integer number (10288855248).

Almost surely, 2^40665475421 is an apocalyptic number.

It is an amenable number.

40665475421 is a deficient number, since it is larger than the sum of its proper divisors (489945571).

40665475421 is an equidigital number, since it uses as much as digits as its factorization.

40665475421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489945570.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 40665475421 in words is "forty billion, six hundred sixty-five million, four hundred seventy-five thousand, four hundred twenty-one".