40144044691 has 2 divisors, whose sum is σ = 40144044692. Its totient is φ = 40144044690.

The previous prime is 40144044679. The next prime is 40144044719. The reversal of 40144044691 is 19644044104.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40144044691 is a prime.

It is a super-2 number, since 2×40144044691² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40144044691.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20072022345 + 20072022346.

It is an arithmetic number, because the mean of its divisors is an integer number (20072022346).

Almost surely, 2^40144044691 is an apocalyptic number.

40144044691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40144044691 is an equidigital number, since it uses as much as digits as its factorization.

40144044691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 37.

Adding to 40144044691 its reverse (19644044104), we get a palindrome (59788088795).

The spelling of 40144044691 in words is "forty billion, one hundred forty-four million, forty-four thousand, six hundred ninety-one".