40013221613 has 2 divisors, whose sum is σ = 40013221614. Its totient is φ = 40013221612.

The previous prime is 40013221603. The next prime is 40013221649. The reversal of 40013221613 is 31612231004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34394669764 + 5618551849 = 185458^2 + 74957^2 .

It is a cyclic number.

It is not a de Polignac number, because 40013221613 - 2⁴ = 40013221597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40013221603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20006610806 + 20006610807.

It is an arithmetic number, because the mean of its divisors is an integer number (20006610807).

Almost surely, 2^40013221613 is an apocalyptic number.

It is an amenable number.

40013221613 is a deficient number, since it is larger than the sum of its proper divisors (1).

40013221613 is an equidigital number, since it uses as much as digits as its factorization.

40013221613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 40013221613 its reverse (31612231004), we get a palindrome (71625452617).

The spelling of 40013221613 in words is "forty billion, thirteen million, two hundred twenty-one thousand, six hundred thirteen".