40921819565 has 16 divisors (see below), whose sum is σ = 53575361280. Its totient is φ = 29758557120.

The previous prime is 40921819553. The next prime is 40921819567. The reversal of 40921819565 is 56591812904.

It is not a de Polignac number, because 40921819565 - 2¹⁰ = 40921818541 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40921819567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 705071 + ... + 760899.

It is an arithmetic number, because the mean of its divisors is an integer number (3348460080).

Almost surely, 2^40921819565 is an apocalyptic number.

It is an amenable number.

40921819565 is a deficient number, since it is larger than the sum of its proper divisors (12653541715).

40921819565 is a wasteful number, since it uses less digits than its factorization.

40921819565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69172.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 40921819565 in words is "forty billion, nine hundred twenty-one million, eight hundred nineteen thousand, five hundred sixty-five".