40164330821 has 2 divisors, whose sum is σ = 40164330822. Its totient is φ = 40164330820.

The previous prime is 40164330799. The next prime is 40164330827. The reversal of 40164330821 is 12803346104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34302744100 + 5861586721 = 185210^2 + 76561^2 .

It is a cyclic number.

It is not a de Polignac number, because 40164330821 - 2⁶ = 40164330757 is a prime.

It is a super-2 number, since 2×40164330821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40164330827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20082165410 + 20082165411.

It is an arithmetic number, because the mean of its divisors is an integer number (20082165411).

Almost surely, 2^40164330821 is an apocalyptic number.

It is an amenable number.

40164330821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40164330821 is an equidigital number, since it uses as much as digits as its factorization.

40164330821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

Adding to 40164330821 its reverse (12803346104), we get a palindrome (52967676925).

The spelling of 40164330821 in words is "forty billion, one hundred sixty-four million, three hundred thirty thousand, eight hundred twenty-one".