40836504781 has 2 divisors, whose sum is σ = 40836504782. Its totient is φ = 40836504780.

The previous prime is 40836504721. The next prime is 40836504829. The reversal of 40836504781 is 18740563804.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40056419881 + 780084900 = 200141^2 + 27930^2 .

It is a cyclic number.

It is not a de Polignac number, because 40836504781 - 2¹⁵ = 40836472013 is a prime.

It is a super-2 number, since 2×40836504781² (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 (40836504721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20418252390 + 20418252391.

It is an arithmetic number, because the mean of its divisors is an integer number (20418252391).

Almost surely, 2^40836504781 is an apocalyptic number.

It is an amenable number.

40836504781 is a deficient number, since it is larger than the sum of its proper divisors (1).

40836504781 is an equidigital number, since it uses as much as digits as its factorization.

40836504781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 40836504781 in words is "forty billion, eight hundred thirty-six million, five hundred four thousand, seven hundred eighty-one".