40051563821 has 2 divisors, whose sum is σ = 40051563822. Its totient is φ = 40051563820.

The previous prime is 40051563809. The next prime is 40051563823. The reversal of 40051563821 is 12836515004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24425313796 + 15626250025 = 156286^2 + 125005^2 .

It is a cyclic number.

It is not a de Polignac number, because 40051563821 - 2¹⁸ = 40051301677 is a prime.

It is a super-2 number, since 2×40051563821² (a number of 22 digits) contains 22 as substring.

Together with 40051563823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40051563823) 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 as a sum of consecutive naturals, namely, 20025781910 + 20025781911.

It is an arithmetic number, because the mean of its divisors is an integer number (20025781911).

Almost surely, 2^40051563821 is an apocalyptic number.

It is an amenable number.

40051563821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40051563821 is an equidigital number, since it uses as much as digits as its factorization.

40051563821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 40051563821 in words is "forty billion, fifty-one million, five hundred sixty-three thousand, eight hundred twenty-one".